Номер 4, страница 119, часть 1 - гдз по алгебре 10 класс учебник Пак, Ардакулы

Алгебра, 10 класс Учебник, авторы: Пак Олег Владимирович, Ардакулы Дархан, Ескендирова Елена Викторовна, издательство Алматыкітап баспасы, Алматы, 2019

Авторы: Пак О. В., Ардакулы Д., Ескендирова Е. В.

Тип: Учебник

Издательство: Алматыкітап баспасы

Год издания: 2019 - 2026

Часть: 1

ISBN: 978-601-01-3958-9

Рекомендовано Министерством образования и науки Республики Казахстан

Часть 1. Глава 2. Тригонометрические функции. Параграф 5. Уравнения и неравенства с аркфункциями. Задачи - номер 4, страница 119.

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                    }
                    "field_publisher" => Illuminate\Database\Eloquent\Collection {#1072
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                    "field_author" => Illuminate\Database\Eloquent\Collection {#1074
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                    }
                    "field_country" => Illuminate\Database\Eloquent\Collection {#1081
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                    }
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                    }
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                    }
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        }
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          #table: "branches"
          #primaryKey: "id"
          #keyType: "int"
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            "created_at" => "2026-04-10 13:58:26"
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                0 => App\Models\Term {#1131
                  #connection: "mysql"
                  #table: "terms"
                  #primaryKey: "id"
                  #keyType: "int"
                  +incrementing: false
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                  #withCount: []
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                    "created_at" => "2026-04-10 13:58:26"
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                0 => App\Models\Book {#1133
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                          +usesUniqueIds: false
                          #hidden: []
                          #visible: []
                          #fillable: []
                          #guarded: array:1 [
                            0 => "*"
                          ]
                        }
                        1 => App\Models\Term {#1142
                          #connection: "mysql"
                          #table: "terms"
                          #primaryKey: "id"
                          #keyType: "int"
                          +incrementing: false
                          #with: []
                          #withCount: []
                          +preventsLazyLoading: false
                          #perPage: 15
                          +exists: true
                          +wasRecentlyCreated: false
                          #escapeWhenCastingToString: false
                          #attributes: array:12 [
                            "id" => 7008
                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
                            "name" => "Ардакулы"
                            "field_bio" => null
                            "field_degree_rp" => null
                            "field_foreign_lang_name" => null
                            "field_foreign_lang_patronymic" => null
                            "field_foreign_lang_surname" => null
                            "field_name" => "Дархан"
                            "field_patronymic" => null
                            "field_surname_rp" => null
                          ]
                          #original: array:12 [
                            "id" => 7008
                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
                            "name" => "Ардакулы"
                            "field_bio" => null
                            "field_degree_rp" => null
                            "field_foreign_lang_name" => null
                            "field_foreign_lang_patronymic" => null
                            "field_foreign_lang_surname" => null
                            "field_name" => "Дархан"
                            "field_patronymic" => null
                            "field_surname_rp" => null
                          ]
                          #changes: []
                          #casts: []
                          #classCastCache: []
                          #attributeCastCache: []
                          #dateFormat: null
                          #appends: []
                          #dispatchesEvents: []
                          #observables: []
                          #relations: []
                          #touches: []
                          +timestamps: true
                          +usesUniqueIds: false
                          #hidden: []
                          #visible: []
                          #fillable: []
                          #guarded: array:1 [
                            0 => "*"
                          ]
                        }
                        2 => App\Models\Term {#1143
                          #connection: "mysql"
                          #table: "terms"
                          #primaryKey: "id"
                          #keyType: "int"
                          +incrementing: false
                          #with: []
                          #withCount: []
                          +preventsLazyLoading: false
                          #perPage: 15
                          +exists: true
                          +wasRecentlyCreated: false
                          #escapeWhenCastingToString: false
                          #attributes: array:12 [
                            "id" => 7009
                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
                            "name" => "Ескендирова"
                            "field_bio" => null
                            "field_degree_rp" => null
                            "field_foreign_lang_name" => null
                            "field_foreign_lang_patronymic" => null
                            "field_foreign_lang_surname" => null
                            "field_name" => "Елена"
                            "field_patronymic" => "Викторовна"
                            "field_surname_rp" => null
                          ]
                          #original: array:12 [
                            "id" => 7009
                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
                            "name" => "Ескендирова"
                            "field_bio" => null
                            "field_degree_rp" => null
                            "field_foreign_lang_name" => null
                            "field_foreign_lang_patronymic" => null
                            "field_foreign_lang_surname" => null
                            "field_name" => "Елена"
                            "field_patronymic" => "Викторовна"
                            "field_surname_rp" => null
                          ]
                          #changes: []
                          #casts: []
                          #classCastCache: []
                          #attributeCastCache: []
                          #dateFormat: null
                          #appends: []
                          #dispatchesEvents: []
                          #observables: []
                          #relations: []
                          #touches: []
                          +timestamps: true
                          +usesUniqueIds: false
                          #hidden: []
                          #visible: []
                          #fillable: []
                          #guarded: array:1 [
                            0 => "*"
                          ]
                        }
                      ]
                      #escapeWhenCastingToString: false
                    }
                    "field_author_foreign" => Illuminate\Database\Eloquent\Collection {#1144
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "field_book_type" => Illuminate\Database\Eloquent\Collection {#1145
                      #items: array:1 [
                        0 => App\Models\Term {#1146
                          #connection: "mysql"
                          #table: "terms"
                          #primaryKey: "id"
                          #keyType: "int"
                          +incrementing: false
                          #with: []
                          #withCount: []
                          +preventsLazyLoading: false
                          #perPage: 15
                          +exists: true
                          +wasRecentlyCreated: false
                          #escapeWhenCastingToString: false
                          #attributes: array:10 [
                            "id" => 6671
                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
                            "name" => "Учебник"
                            "field_book_type_foreign" => null
                            "field_cases" => array:6 [ …6]
                            "field_plural_form" => null
                            "field_short_name" => null
                            "field_short_name_foreign" => null
                            "field_translit" => "uchebnik"
                          ]
                          #original: array:10 [
                            "id" => 6671
                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
                            "name" => "Учебник"
                            "field_book_type_foreign" => null
                            "field_cases" => array:6 [ …6]
                            "field_plural_form" => null
                            "field_short_name" => null
                            "field_short_name_foreign" => null
                            "field_translit" => "uchebnik"
                          ]
                          #changes: []
                          #casts: []
                          #classCastCache: []
                          #attributeCastCache: []
                          #dateFormat: null
                          #appends: []
                          #dispatchesEvents: []
                          #observables: []
                          #relations: []
                          #touches: []
                          +timestamps: true
                          +usesUniqueIds: false
                          #hidden: []
                          #visible: []
                          #fillable: []
                          #guarded: array:1 [
                            0 => "*"
                          ]
                        }
                      ]
                      #escapeWhenCastingToString: false
                    }
                    "field_country" => Illuminate\Database\Eloquent\Collection {#1147
                      #items: array:1 [
                        0 => App\Models\Term {#1148
                          #connection: "mysql"
                          #table: "terms"
                          #primaryKey: "id"
                          #keyType: "int"
                          +incrementing: false
                          #with: []
                          #withCount: []
                          +preventsLazyLoading: false
                          #perPage: 15
                          +exists: true
                          +wasRecentlyCreated: false
                          #escapeWhenCastingToString: false
                          #attributes: array:6 [
                            "id" => 6994
                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
                            "name" => "Казахстан"
                            "field_cases" => array:6 [ …6]
                            "field_translit" => "kazakhstan"
                          ]
                          #original: array:6 [
                            "id" => 6994
                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
                            "name" => "Казахстан"
                            "field_cases" => array:6 [ …6]
                            "field_translit" => "kazakhstan"
                          ]
                          #changes: []
                          #casts: []
                          #classCastCache: []
                          #attributeCastCache: []
                          #dateFormat: null
                          #appends: []
                          #dispatchesEvents: []
                          #observables: []
                          #relations: []
                          #touches: []
                          +timestamps: true
                          +usesUniqueIds: false
                          #hidden: []
                          #visible: []
                          #fillable: []
                          #guarded: array:1 [
                            0 => "*"
                          ]
                        }
                      ]
                      #escapeWhenCastingToString: false
                    }
                    "field_city" => Illuminate\Database\Eloquent\Collection {#1149
                      #items: array:1 [
                        0 => App\Models\Term {#1150
                          #connection: "mysql"
                          #table: "terms"
                          #primaryKey: "id"
                          #keyType: "int"
                          +incrementing: false
                          #with: []
                          #withCount: []
                          +preventsLazyLoading: false
                          #perPage: 15
                          +exists: true
                          +wasRecentlyCreated: false
                          #escapeWhenCastingToString: false
                          #attributes: array:6 [
                            "id" => 6995
                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
                            "name" => "Алматы"
                            "field_cases" => array:6 [ …6]
                            "field_translit" => "almaty"
                          ]
                          #original: array:6 [
                            "id" => 6995
                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
                            "name" => "Алматы"
                            "field_cases" => array:6 [ …6]
                            "field_translit" => "almaty"
                          ]
                          #changes: []
                          #casts: []
                          #classCastCache: []
                          #attributeCastCache: []
                          #dateFormat: null
                          #appends: []
                          #dispatchesEvents: []
                          #observables: []
                          #relations: []
                          #touches: []
                          +timestamps: true
                          +usesUniqueIds: false
                          #hidden: []
                          #visible: []
                          #fillable: []
                          #guarded: array:1 [
                            0 => "*"
                          ]
                        }
                      ]
                      #escapeWhenCastingToString: false
                    }
                    "field_series" => Illuminate\Database\Eloquent\Collection {#1151
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "field_umk" => Illuminate\Database\Eloquent\Collection {#1152
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "field_level_of_education" => Illuminate\Database\Eloquent\Collection {#1153
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "field_standart_of_education" => Illuminate\Database\Eloquent\Collection {#1154
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "field_publication_number" => null
                    "field_publication_type" => Illuminate\Database\Eloquent\Collection {#1155
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "field_under_the_edition" => Illuminate\Database\Eloquent\Collection {#1156
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "field_under_the_edition_degree" => null
                    "field_cover_description" => null
                    "field_publication_year" => "2019"
                    "field_publication_year_until" => null
                    "field_part" => "1, 2"
                    "field_part_writing" => "Часть"
                    "field_second_foreign_language" => null
                    "field_for_whom" => "Учебник для учащихся 10 класса общеобразовательной школы общественно-гуманитарного направления"
                    "field_allowed" => "Рекомендовано Министерством образования и науки Республики Казахстан"
                    "field_reserve_field" => null
                    "field_link_to_source" => null
                    "field_tasks_count" => "1063"
                    "field_priority" => "6"
                    "field_default_folder" => "/algebra_10/baspasy-u19/"
                    "field_isbn" => "978-601-01-3958-9"
                    "field_cover" => array:1 [
                      0 => "/media/algebra_10/baspasy-u19/covers/cover1.webp?ts=1752152865"
                    ]
                    "field_cover_alts" => array:1 [
                      0 => ""
                    ]
                    "field_covers" => array:1 [
                      0 => array:4 [
                        "path" => "/media/algebra_10/baspasy-u19/covers/cover1.webp?ts=1752152865"
                        "alt" => ""
                        "width" => "1940"
                        "height" => "2895"
                      ]
                    ]
                    "field_popular_book" => null
                    "field_recommended_books" => Illuminate\Database\Eloquent\Collection {#1157
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "field_new_book" => Illuminate\Database\Eloquent\Collection {#1158
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "field_old_book" => Illuminate\Database\Eloquent\Collection {#1159
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "field_url" => "/10-klass/algebra/baspasy-pak-uchebnik"
                    "field_cover_color" => Illuminate\Database\Eloquent\Collection {#1160
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "field_metatags_title" => null
                    "field_metatags_description" => null
                    "field_h1" => null
                    "field_description_top" => null
                    "field_description_bottom" => null
                    "breadcrumbs" => array:3 [
                      "class" => 381
                      "subject" => 542
                      "class_subject" => 387
                    ]
                  ]
                  #original: array:50 [
                    "id" => 4295
                    "created_at" => "2026-04-10 13:58:26"
                    "updated_at" => null
                    "field_tree_default_status" => "tasks"
                    "field_pages_status" => null
                    "field_subject" => Illuminate\Database\Eloquent\Collection {#1134}
                    "field_class" => Illuminate\Database\Eloquent\Collection {#1136}
                    "field_publisher" => Illuminate\Database\Eloquent\Collection {#1138}
                    "field_author" => Illuminate\Database\Eloquent\Collection {#1140}
                    "field_author_foreign" => Illuminate\Database\Eloquent\Collection {#1144}
                    "field_book_type" => Illuminate\Database\Eloquent\Collection {#1145}
                    "field_country" => Illuminate\Database\Eloquent\Collection {#1147}
                    "field_city" => Illuminate\Database\Eloquent\Collection {#1149}
                    "field_series" => Illuminate\Database\Eloquent\Collection {#1151}
                    "field_umk" => Illuminate\Database\Eloquent\Collection {#1152}
                    "field_level_of_education" => Illuminate\Database\Eloquent\Collection {#1153}
                    "field_standart_of_education" => Illuminate\Database\Eloquent\Collection {#1154}
                    "field_publication_number" => null
                    "field_publication_type" => Illuminate\Database\Eloquent\Collection {#1155}
                    "field_under_the_edition" => Illuminate\Database\Eloquent\Collection {#1156}
                    "field_under_the_edition_degree" => null
                    "field_cover_description" => null
                    "field_publication_year" => "2019"
                    "field_publication_year_until" => null
                    "field_part" => "1, 2"
                    "field_part_writing" => "Часть"
                    "field_second_foreign_language" => null
                    "field_for_whom" => "Учебник для учащихся 10 класса общеобразовательной школы общественно-гуманитарного направления"
                    "field_allowed" => "Рекомендовано Министерством образования и науки Республики Казахстан"
                    "field_reserve_field" => null
                    "field_link_to_source" => null
                    "field_tasks_count" => "1063"
                    "field_priority" => "6"
                    "field_default_folder" => "/algebra_10/baspasy-u19/"
                    "field_isbn" => "978-601-01-3958-9"
                    "field_cover" => array:1 [
                      0 => "/media/algebra_10/baspasy-u19/covers/cover1.webp?ts=1752152865"
                    ]
                    "field_cover_alts" => array:1 [
                      0 => ""
                    ]
                    "field_covers" => array:1 [
                      0 => array:4 [
                        "path" => "/media/algebra_10/baspasy-u19/covers/cover1.webp?ts=1752152865"
                        "alt" => ""
                        "width" => "1940"
                        "height" => "2895"
                      ]
                    ]
                    "field_popular_book" => null
                    "field_recommended_books" => Illuminate\Database\Eloquent\Collection {#1157}
                    "field_new_book" => Illuminate\Database\Eloquent\Collection {#1158}
                    "field_old_book" => Illuminate\Database\Eloquent\Collection {#1159}
                    "field_url" => "/10-klass/algebra/baspasy-pak-uchebnik"
                    "field_cover_color" => Illuminate\Database\Eloquent\Collection {#1160}
                    "field_metatags_title" => null
                    "field_metatags_description" => null
                    "field_h1" => null
                    "field_description_top" => null
                    "field_description_bottom" => null
                    "breadcrumbs" => array:3 [
                      "class" => 381
                      "subject" => 542
                      "class_subject" => 387
                    ]
                  ]
                  #changes: []
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                  #classCastCache: []
                  #attributeCastCache: []
                  #dateFormat: null
                  #appends: []
                  #dispatchesEvents: []
                  #observables: []
                  #relations: []
                  #touches: []
                  +timestamps: true
                  +usesUniqueIds: false
                  #hidden: []
                  #visible: []
                  #fillable: []
                  #guarded: array:1 [
                    0 => "*"
                  ]
                }
              ]
              #escapeWhenCastingToString: false
            }
            "branch_parent" => Illuminate\Database\Eloquent\Collection {#1161
              #items: array:1 [
                0 => App\Models\Branch {#1162
                  #connection: "mysql"
                  #table: "branches"
                  #primaryKey: "id"
                  #keyType: "int"
                  +incrementing: true
                  #with: []
                  #withCount: []
                  +preventsLazyLoading: false
                  #perPage: 15
                  +exists: true
                  +wasRecentlyCreated: false
                  #escapeWhenCastingToString: false
                  #attributes: array:24 [
                    "id" => 1119358
                    "created_at" => "2026-04-10 13:58:26"
                    "updated_at" => null
                    "field_display_title" => "Тригонометрические функции"
                    "field_branch_order" => "2"
                    "field_url" => null
                    "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1163 …2}
                    "field_page_start" => "71"
                    "field_branch_display" => "0"
                    "field_branch_expanded" => "0"
                    "field_display_branch_in_title" => "1"
                    "field_display_task_interval" => "0"
                    "field_display_branch_page" => "1"
                    "field_branch_title_in_content" => "0"
                    "field_navigation_title" => null
                    "field_metatags_title" => null
                    "field_metatags_description" => null
                    "field_h1" => null
                    "field_description_top" => null
                    "field_description_bottom" => null
                    "field_branch_cover" => []
                    "field_branch_covers" => []
                    "book" => Illuminate\Database\Eloquent\Collection {#1165 …2}
                    "branch_parent" => Illuminate\Database\Eloquent\Collection {#1194 …2}
                  ]
                  #original: array:24 [
                    "id" => 1119358
                    "created_at" => "2026-04-10 13:58:26"
                    "updated_at" => null
                    "field_display_title" => "Тригонометрические функции"
                    "field_branch_order" => "2"
                    "field_url" => null
                    "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1163 …2}
                    "field_page_start" => "71"
                    "field_branch_display" => "0"
                    "field_branch_expanded" => "0"
                    "field_display_branch_in_title" => "1"
                    "field_display_task_interval" => "0"
                    "field_display_branch_page" => "1"
                    "field_branch_title_in_content" => "0"
                    "field_navigation_title" => null
                    "field_metatags_title" => null
                    "field_metatags_description" => null
                    "field_h1" => null
                    "field_description_top" => null
                    "field_description_bottom" => null
                    "field_branch_cover" => []
                    "field_branch_covers" => []
                    "book" => Illuminate\Database\Eloquent\Collection {#1165 …2}
                    "branch_parent" => Illuminate\Database\Eloquent\Collection {#1194 …2}
                  ]
                  #changes: []
                  #casts: []
                  #classCastCache: []
                  #attributeCastCache: []
                  #dateFormat: null
                  #appends: []
                  #dispatchesEvents: []
                  #observables: []
                  #relations: []
                  #touches: []
                  +timestamps: true
                  +usesUniqueIds: false
                  #hidden: []
                  #visible: []
                  #fillable: []
                  #guarded: array:1 [
                    0 => "*"
                  ]
                }
              ]
              #escapeWhenCastingToString: false
            }
          ]
          #original: array:24 [
            "id" => 1119380
            "created_at" => "2026-04-10 13:58:26"
            "updated_at" => null
            "field_display_title" => "Уравнения и неравенства с аркфункциями"
            "field_branch_order" => "5"
            "field_url" => null
            "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1130}
            "field_page_start" => "117"
            "field_branch_display" => "0"
            "field_branch_expanded" => "0"
            "field_display_branch_in_title" => "1"
            "field_display_task_interval" => "0"
            "field_display_branch_page" => "1"
            "field_branch_title_in_content" => "0"
            "field_navigation_title" => null
            "field_metatags_title" => null
            "field_metatags_description" => null
            "field_h1" => null
            "field_description_top" => null
            "field_description_bottom" => null
            "field_branch_cover" => []
            "field_branch_covers" => []
            "book" => Illuminate\Database\Eloquent\Collection {#1132}
            "branch_parent" => Illuminate\Database\Eloquent\Collection {#1161}
          ]
          #changes: []
          #casts: []
          #classCastCache: []
          #attributeCastCache: []
          #dateFormat: null
          #appends: []
          #dispatchesEvents: []
          #observables: []
          #relations: []
          #touches: []
          +timestamps: true
          +usesUniqueIds: false
          #hidden: []
          #visible: []
          #fillable: []
          #guarded: array:1 [
            0 => "*"
          ]
        }
        3 => App\Models\Branch {#1200
          #connection: "mysql"
          #table: "branches"
          #primaryKey: "id"
          #keyType: "int"
          +incrementing: true
          #with: []
          #withCount: []
          +preventsLazyLoading: false
          #perPage: 15
          +exists: true
          +wasRecentlyCreated: false
          #escapeWhenCastingToString: false
          #attributes: array:24 [
            "id" => 1119381
            "created_at" => "2026-04-10 13:58:26"
            "updated_at" => null
            "field_display_title" => "Задачи"
            "field_branch_order" => null
            "field_url" => null
            "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1201
              #items: []
              #escapeWhenCastingToString: false
            }
            "field_page_start" => "118"
            "field_branch_display" => "0"
            "field_branch_expanded" => "0"
            "field_display_branch_in_title" => "1"
            "field_display_task_interval" => "0"
            "field_display_branch_page" => "1"
            "field_branch_title_in_content" => "0"
            "field_navigation_title" => null
            "field_metatags_title" => null
            "field_metatags_description" => null
            "field_h1" => null
            "field_description_top" => null
            "field_description_bottom" => null
            "field_branch_cover" => []
            "field_branch_covers" => []
            "book" => Illuminate\Database\Eloquent\Collection {#1202
              #items: array:1 [
                0 => App\Models\Book {#1133}
              ]
              #escapeWhenCastingToString: false
            }
            "branch_parent" => Illuminate\Database\Eloquent\Collection {#1203
              #items: array:1 [
                0 => App\Models\Branch {#1204
                  #connection: "mysql"
                  #table: "branches"
                  #primaryKey: "id"
                  #keyType: "int"
                  +incrementing: true
                  #with: []
                  #withCount: []
                  +preventsLazyLoading: false
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            "text" => "<p><strong>4. (3)</strong> Решите уравнения:</p><p><strong>а)</strong></p><p>$3\arcsin^2 x + 5\pi\arcsin x - 2\pi^2 = 0;$</p><p><strong>б)</strong></p><p>$3\arcsin^2 x + 5\pi\arcsin x + 2\pi^2 = 0.$</p>"
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            "text" => "<p><strong>а)</strong> $8\arcsin^2 x + 5\pi\arcsin x - 2\pi^2 = 0$</p><p>Данное уравнение является квадратным относительно $\arcsin x$. Выполним замену переменной. Пусть $y = \arcsin x$. Тогда уравнение принимает вид:</p><p>$8y^2 + 5\pi y - 2\pi^2 = 0$</p><p>Решим это квадратное уравнение относительно $y$ с помощью дискриминанта. В данном случае коэффициенты: $a=8$, $b=5\pi$, $c=-2\pi^2$.</p><p>Найдем дискриминант $D$:</p><p>$D = b^2 - 4ac = (5\pi)^2 - 4 \cdot 8 \cdot (-2\pi^2) = 25\pi^2 + 64\pi^2 = 89\pi^2$</p><p>Так как $D > 0$, уравнение имеет два действительных корня. Найдем их:</p><p>$\sqrt{D} = \sqrt{89\pi^2} = \pi\sqrt{89}$</p><p>$y_{1,2} = \frac{-b \pm \sqrt{D}}{2a} = \frac{-5\pi \pm \pi\sqrt{89}}{2 \cdot 8} = \frac{\pi(-5 \pm \sqrt{89})}{16}$</p><p>Получаем два возможных значения для $y$:</p><p>$y_1 = \frac{\pi(\sqrt{89} - 5)}{16}$</p><p>$y_2 = \frac{\pi(-5 - \sqrt{89})}{16} = -\frac{\pi(5 + \sqrt{89})}{16}$</p><p>Теперь необходимо выполнить обратную замену $y = \arcsin x$. Область значений функции арксинус: $E(\arcsin x) = [-\frac{\pi}{2}, \frac{\pi}{2}]$. Проверим, принадлежат ли найденные корни $y_1$ и $y_2$ этому промежутку.</p><p>Проверка для $y_1 = \frac{\pi(\sqrt{89} - 5)}{16}$:</p><p>Оценим значение $\sqrt{89}$. Так как $9^2 = 81$ и $10^2 = 100$, то $9 < \sqrt{89} < 10$.</p><p>Тогда $9 - 5 < \sqrt{89} - 5 < 10 - 5$, что равносильно $4 < \sqrt{89} - 5 < 5$.</p><p>Умножим неравенство на $\frac{\pi}{16}$: $\frac{4\pi}{16} < \frac{\pi(\sqrt{89} - 5)}{16} < \frac{5\pi}{16}$, то есть $\frac{\pi}{4} < y_1 < \frac{5\pi}{16}$.</p><p>Так как $-\frac{\pi}{2} \le \frac{\pi}{4}$ и $\frac{5\pi}{16} \le \frac{\pi}{2}$ (поскольку $\frac{5}{16} \le \frac{1}{2}$), то значение $y_1$ принадлежит области значений арксинуса. Следовательно, этот корень подходит.</p><p>$\arcsin x = \frac{\pi(\sqrt{89} - 5)}{16} \implies x = \sin\left(\frac{\pi(\sqrt{89} - 5)}{16}\right)$</p><p>Проверка для $y_2 = -\frac{\pi(5 + \sqrt{89})}{16}$:</p><p>Используя оценку $9 < \sqrt{89} < 10$, имеем $5+9 < 5+\sqrt{89} < 5+10$, что равносильно $14 < 5+\sqrt{89} < 15$.</p><p>Умножим на $-\frac{\pi}{16}$, меняя знаки неравенства: $-\frac{15\pi}{16} < y_2 < -\frac{14\pi}{16}$.</p><p>Упростим правую часть: $y_2 < -\frac{7\pi}{8}$. Поскольку $-\frac{7\pi}{8} < -\frac{4\pi}{8} = -\frac{\pi}{2}$, значение $y_2$ не входит в область значений арксинуса. Этот корень является посторонним.</p><p>Таким образом, уравнение имеет только одно решение.</p><p><strong>Ответ:</strong> $x = \sin\left(\frac{\pi(\sqrt{89}-5)}{16}\right)$</p><p><strong>б)</strong> $8\arcsin^2 x + 5\pi\arcsin x + 2\pi^2 = 0$</p><p>Как и в предыдущем пункте, сделаем замену $y = \arcsin x$. Получим квадратное уравнение:</p><p>$8y^2 + 5\pi y + 2\pi^2 = 0$</p><p>Вычислим его дискриминант $D$, где $a=8$, $b=5\pi$, $c=2\pi^2$:</p><p>$D = b^2 - 4ac = (5\pi)^2 - 4 \cdot 8 \cdot (2\pi^2) = 25\pi^2 - 64\pi^2 = -39\pi^2$</p><p>Поскольку дискриминант $D < 0$, квадратное уравнение $8y^2 + 5\pi y + 2\pi^2 = 0$ не имеет действительных корней.</p><p>Так как не существует действительных значений $y$, удовлетворяющих этому уравнению, то не существует и таких значений $x$, для которых $\arcsin x = y$. Следовательно, исходное уравнение не имеет решений.</p><p><strong>Ответ:</strong> решений нет.</p>"
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            "text" => "<p><strong>а)</strong> $8\arcsin^2 x + 5\pi\arcsin x - 2\pi^2 = 0$</p><p>Данное уравнение является квадратным относительно $\arcsin x$. Выполним замену переменной. Пусть $y = \arcsin x$. Тогда уравнение принимает вид:</p><p>$8y^2 + 5\pi y - 2\pi^2 = 0$</p><p>Решим это квадратное уравнение относительно $y$ с помощью дискриминанта. В данном случае коэффициенты: $a=8$, $b=5\pi$, $c=-2\pi^2$.</p><p>Найдем дискриминант $D$:</p><p>$D = b^2 - 4ac = (5\pi)^2 - 4 \cdot 8 \cdot (-2\pi^2) = 25\pi^2 + 64\pi^2 = 89\pi^2$</p><p>Так как $D > 0$, уравнение имеет два действительных корня. Найдем их:</p><p>$\sqrt{D} = \sqrt{89\pi^2} = \pi\sqrt{89}$</p><p>$y_{1,2} = \frac{-b \pm \sqrt{D}}{2a} = \frac{-5\pi \pm \pi\sqrt{89}}{2 \cdot 8} = \frac{\pi(-5 \pm \sqrt{89})}{16}$</p><p>Получаем два возможных значения для $y$:</p><p>$y_1 = \frac{\pi(\sqrt{89} - 5)}{16}$</p><p>$y_2 = \frac{\pi(-5 - \sqrt{89})}{16} = -\frac{\pi(5 + \sqrt{89})}{16}$</p><p>Теперь необходимо выполнить обратную замену $y = \arcsin x$. Область значений функции арксинус: $E(\arcsin x) = [-\frac{\pi}{2}, \frac{\pi}{2}]$. Проверим, принадлежат ли найденные корни $y_1$ и $y_2$ этому промежутку.</p><p>Проверка для $y_1 = \frac{\pi(\sqrt{89} - 5)}{16}$:</p><p>Оценим значение $\sqrt{89}$. Так как $9^2 = 81$ и $10^2 = 100$, то $9 < \sqrt{89} < 10$.</p><p>Тогда $9 - 5 < \sqrt{89} - 5 < 10 - 5$, что равносильно $4 < \sqrt{89} - 5 < 5$.</p><p>Умножим неравенство на $\frac{\pi}{16}$: $\frac{4\pi}{16} < \frac{\pi(\sqrt{89} - 5)}{16} < \frac{5\pi}{16}$, то есть $\frac{\pi}{4} < y_1 < \frac{5\pi}{16}$.</p><p>Так как $-\frac{\pi}{2} \le \frac{\pi}{4}$ и $\frac{5\pi}{16} \le \frac{\pi}{2}$ (поскольку $\frac{5}{16} \le \frac{1}{2}$), то значение $y_1$ принадлежит области значений арксинуса. Следовательно, этот корень подходит.</p><p>$\arcsin x = \frac{\pi(\sqrt{89} - 5)}{16} \implies x = \sin\left(\frac{\pi(\sqrt{89} - 5)}{16}\right)$</p><p>Проверка для $y_2 = -\frac{\pi(5 + \sqrt{89})}{16}$:</p><p>Используя оценку $9 < \sqrt{89} < 10$, имеем $5+9 < 5+\sqrt{89} < 5+10$, что равносильно $14 < 5+\sqrt{89} < 15$.</p><p>Умножим на $-\frac{\pi}{16}$, меняя знаки неравенства: $-\frac{15\pi}{16} < y_2 < -\frac{14\pi}{16}$.</p><p>Упростим правую часть: $y_2 < -\frac{7\pi}{8}$. Поскольку $-\frac{7\pi}{8} < -\frac{4\pi}{8} = -\frac{\pi}{2}$, значение $y_2$ не входит в область значений арксинуса. Этот корень является посторонним.</p><p>Таким образом, уравнение имеет только одно решение.</p><p><strong>Ответ:</strong> $x = \sin\left(\frac{\pi(\sqrt{89}-5)}{16}\right)$</p><p><strong>б)</strong> $8\arcsin^2 x + 5\pi\arcsin x + 2\pi^2 = 0$</p><p>Как и в предыдущем пункте, сделаем замену $y = \arcsin x$. Получим квадратное уравнение:</p><p>$8y^2 + 5\pi y + 2\pi^2 = 0$</p><p>Вычислим его дискриминант $D$, где $a=8$, $b=5\pi$, $c=2\pi^2$:</p><p>$D = b^2 - 4ac = (5\pi)^2 - 4 \cdot 8 \cdot (2\pi^2) = 25\pi^2 - 64\pi^2 = -39\pi^2$</p><p>Поскольку дискриминант $D < 0$, квадратное уравнение $8y^2 + 5\pi y + 2\pi^2 = 0$ не имеет действительных корней.</p><p>Так как не существует действительных значений $y$, удовлетворяющих этому уравнению, то не существует и таких значений $x$, для которых $\arcsin x = y$. Следовательно, исходное уравнение не имеет решений.</p><p><strong>Ответ:</strong> решений нет.</p>"
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№4 (с. 119)
Условие. №4 (с. 119)
скриншот условия
Алгебра, 10 класс Учебник, авторы: Пак Олег Владимирович, Ардакулы Дархан, Ескендирова Елена Викторовна, издательство Алматыкітап баспасы, Алматы, 2019, Часть 1, страница 119, номер 4, Условие

4. (3) Решите уравнения:

а)

$3\arcsin^2 x + 5\pi\arcsin x - 2\pi^2 = 0;$

б)

$3\arcsin^2 x + 5\pi\arcsin x + 2\pi^2 = 0.$

Решение 2 (rus). №4 (с. 119)

а) $8\arcsin^2 x + 5\pi\arcsin x - 2\pi^2 = 0$

Данное уравнение является квадратным относительно $\arcsin x$. Выполним замену переменной. Пусть $y = \arcsin x$. Тогда уравнение принимает вид:

$8y^2 + 5\pi y - 2\pi^2 = 0$

Решим это квадратное уравнение относительно $y$ с помощью дискриминанта. В данном случае коэффициенты: $a=8$, $b=5\pi$, $c=-2\pi^2$.

Найдем дискриминант $D$:

$D = b^2 - 4ac = (5\pi)^2 - 4 \cdot 8 \cdot (-2\pi^2) = 25\pi^2 + 64\pi^2 = 89\pi^2$

Так как $D > 0$, уравнение имеет два действительных корня. Найдем их:

$\sqrt{D} = \sqrt{89\pi^2} = \pi\sqrt{89}$

$y_{1,2} = \frac{-b \pm \sqrt{D}}{2a} = \frac{-5\pi \pm \pi\sqrt{89}}{2 \cdot 8} = \frac{\pi(-5 \pm \sqrt{89})}{16}$

Получаем два возможных значения для $y$:

$y_1 = \frac{\pi(\sqrt{89} - 5)}{16}$

$y_2 = \frac{\pi(-5 - \sqrt{89})}{16} = -\frac{\pi(5 + \sqrt{89})}{16}$

Теперь необходимо выполнить обратную замену $y = \arcsin x$. Область значений функции арксинус: $E(\arcsin x) = [-\frac{\pi}{2}, \frac{\pi}{2}]$. Проверим, принадлежат ли найденные корни $y_1$ и $y_2$ этому промежутку.

Проверка для $y_1 = \frac{\pi(\sqrt{89} - 5)}{16}$:

Оценим значение $\sqrt{89}$. Так как $9^2 = 81$ и $10^2 = 100$, то $9 < \sqrt{89} < 10$.

Тогда $9 - 5 < \sqrt{89} - 5 < 10 - 5$, что равносильно $4 < \sqrt{89} - 5 < 5$.

Умножим неравенство на $\frac{\pi}{16}$: $\frac{4\pi}{16} < \frac{\pi(\sqrt{89} - 5)}{16} < \frac{5\pi}{16}$, то есть $\frac{\pi}{4} < y_1 < \frac{5\pi}{16}$.

Так как $-\frac{\pi}{2} \le \frac{\pi}{4}$ и $\frac{5\pi}{16} \le \frac{\pi}{2}$ (поскольку $\frac{5}{16} \le \frac{1}{2}$), то значение $y_1$ принадлежит области значений арксинуса. Следовательно, этот корень подходит.

$\arcsin x = \frac{\pi(\sqrt{89} - 5)}{16} \implies x = \sin\left(\frac{\pi(\sqrt{89} - 5)}{16}\right)$

Проверка для $y_2 = -\frac{\pi(5 + \sqrt{89})}{16}$:

Используя оценку $9 < \sqrt{89} < 10$, имеем $5+9 < 5+\sqrt{89} < 5+10$, что равносильно $14 < 5+\sqrt{89} < 15$.

Умножим на $-\frac{\pi}{16}$, меняя знаки неравенства: $-\frac{15\pi}{16} < y_2 < -\frac{14\pi}{16}$.

Упростим правую часть: $y_2 < -\frac{7\pi}{8}$. Поскольку $-\frac{7\pi}{8} < -\frac{4\pi}{8} = -\frac{\pi}{2}$, значение $y_2$ не входит в область значений арксинуса. Этот корень является посторонним.

Таким образом, уравнение имеет только одно решение.

Ответ: $x = \sin\left(\frac{\pi(\sqrt{89}-5)}{16}\right)$

б) $8\arcsin^2 x + 5\pi\arcsin x + 2\pi^2 = 0$

Как и в предыдущем пункте, сделаем замену $y = \arcsin x$. Получим квадратное уравнение:

$8y^2 + 5\pi y + 2\pi^2 = 0$

Вычислим его дискриминант $D$, где $a=8$, $b=5\pi$, $c=2\pi^2$:

$D = b^2 - 4ac = (5\pi)^2 - 4 \cdot 8 \cdot (2\pi^2) = 25\pi^2 - 64\pi^2 = -39\pi^2$

Поскольку дискриминант $D < 0$, квадратное уравнение $8y^2 + 5\pi y + 2\pi^2 = 0$ не имеет действительных корней.

Так как не существует действительных значений $y$, удовлетворяющих этому уравнению, то не существует и таких значений $x$, для которых $\arcsin x = y$. Следовательно, исходное уравнение не имеет решений.

Ответ: решений нет.

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