Номер 10, страница 175, 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 3. Тригонометрические уравнения и неравенства. Параграф 3. Простейшие тригонометрические неравенства. 3.4. Системы простейших тригонометрических неравенств. Задачи - номер 10, страница 175.

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                          #original: array:6 [ …6]
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                        }
                      ]
                      #escapeWhenCastingToString: false
                    }
                    "field_author" => Illuminate\Database\Eloquent\Collection {#1127
                      #items: array:3 [
                        0 => App\Models\Term {#1128
                          #connection: "mysql"
                          #table: "terms"
                          #primaryKey: "id"
                          #keyType: "int"
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                          #with: []
                          #withCount: []
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                          #attributes: array:12 [ …12]
                          #original: array:12 [ …12]
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                          #touches: []
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                          +usesUniqueIds: false
                          #hidden: []
                          #visible: []
                          #fillable: []
                          #guarded: array:1 [ …1]
                        }
                        1 => App\Models\Term {#1129
                          #connection: "mysql"
                          #table: "terms"
                          #primaryKey: "id"
                          #keyType: "int"
                          +incrementing: false
                          #with: []
                          #withCount: []
                          +preventsLazyLoading: false
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                          #escapeWhenCastingToString: false
                          #attributes: array:12 [ …12]
                          #original: array:12 [ …12]
                          #changes: []
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                          #attributeCastCache: []
                          #dateFormat: null
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                          #relations: []
                          #touches: []
                          +timestamps: true
                          +usesUniqueIds: false
                          #hidden: []
                          #visible: []
                          #fillable: []
                          #guarded: array:1 [ …1]
                        }
                        2 => App\Models\Term {#1130
                          #connection: "mysql"
                          #table: "terms"
                          #primaryKey: "id"
                          #keyType: "int"
                          +incrementing: false
                          #with: []
                          #withCount: []
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                          #escapeWhenCastingToString: false
                          #attributes: array:12 [ …12]
                          #original: array:12 [ …12]
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                          #attributeCastCache: []
                          #dateFormat: null
                          #appends: []
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                          #relations: []
                          #touches: []
                          +timestamps: true
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                          #hidden: []
                          #visible: []
                          #fillable: []
                          #guarded: array:1 [ …1]
                        }
                      ]
                      #escapeWhenCastingToString: false
                    }
                    "field_author_foreign" => Illuminate\Database\Eloquent\Collection {#1131
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "field_book_type" => Illuminate\Database\Eloquent\Collection {#1132
                      #items: array:1 [
                        0 => App\Models\Term {#1133
                          #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 [ …10]
                          #original: array:10 [ …10]
                          #changes: []
                          #casts: []
                          #classCastCache: []
                          #attributeCastCache: []
                          #dateFormat: null
                          #appends: []
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                          #relations: []
                          #touches: []
                          +timestamps: true
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                          #hidden: []
                          #visible: []
                          #fillable: []
                          #guarded: array:1 [ …1]
                        }
                      ]
                      #escapeWhenCastingToString: false
                    }
                    "field_country" => Illuminate\Database\Eloquent\Collection {#1134
                      #items: array:1 [
                        0 => App\Models\Term {#1135
                          #connection: "mysql"
                          #table: "terms"
                          #primaryKey: "id"
                          #keyType: "int"
                          +incrementing: false
                          #with: []
                          #withCount: []
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                          #attributes: array:6 [ …6]
                          #original: array:6 [ …6]
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                          #touches: []
                          +timestamps: true
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                          #hidden: []
                          #visible: []
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                          #guarded: array:1 [ …1]
                        }
                      ]
                      #escapeWhenCastingToString: false
                    }
                    "field_city" => Illuminate\Database\Eloquent\Collection {#1136
                      #items: array:1 [
                        0 => App\Models\Term {#1137
                          #connection: "mysql"
                          #table: "terms"
                          #primaryKey: "id"
                          #keyType: "int"
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                          #with: []
                          #withCount: []
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                          +exists: true
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                          #attributes: array:6 [ …6]
                          #original: array:6 [ …6]
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                          #touches: []
                          +timestamps: true
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                          #hidden: []
                          #visible: []
                          #fillable: []
                          #guarded: array:1 [ …1]
                        }
                      ]
                      #escapeWhenCastingToString: false
                    }
                    "field_series" => Illuminate\Database\Eloquent\Collection {#1138
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "field_umk" => Illuminate\Database\Eloquent\Collection {#1139
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "field_level_of_education" => Illuminate\Database\Eloquent\Collection {#1140
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "field_standart_of_education" => Illuminate\Database\Eloquent\Collection {#1141
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "field_publication_number" => null
                    "field_publication_type" => Illuminate\Database\Eloquent\Collection {#1142
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                      #escapeWhenCastingToString: false
                    }
                    "field_under_the_edition" => Illuminate\Database\Eloquent\Collection {#1143
                      #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"
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                    "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"
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                      ]
                    ]
                    "field_popular_book" => null
                    "field_recommended_books" => Illuminate\Database\Eloquent\Collection {#1144
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "field_new_book" => Illuminate\Database\Eloquent\Collection {#1145
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "field_old_book" => Illuminate\Database\Eloquent\Collection {#1146
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "field_url" => "/10-klass/algebra/baspasy-pak-uchebnik"
                    "field_cover_color" => Illuminate\Database\Eloquent\Collection {#1147
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "field_metatags_title" => null
                    "field_metatags_description" => null
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                    "breadcrumbs" => array:3 [
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                      "class_subject" => 387
                    ]
                  ]
                  #original: array:50 [
                    "id" => 4295
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                    "field_subject" => Illuminate\Database\Eloquent\Collection {#1122}
                    "field_class" => Illuminate\Database\Eloquent\Collection {#1123}
                    "field_publisher" => Illuminate\Database\Eloquent\Collection {#1125}
                    "field_author" => Illuminate\Database\Eloquent\Collection {#1127}
                    "field_author_foreign" => Illuminate\Database\Eloquent\Collection {#1131}
                    "field_book_type" => Illuminate\Database\Eloquent\Collection {#1132}
                    "field_country" => Illuminate\Database\Eloquent\Collection {#1134}
                    "field_city" => Illuminate\Database\Eloquent\Collection {#1136}
                    "field_series" => Illuminate\Database\Eloquent\Collection {#1138}
                    "field_umk" => Illuminate\Database\Eloquent\Collection {#1139}
                    "field_level_of_education" => Illuminate\Database\Eloquent\Collection {#1140}
                    "field_standart_of_education" => Illuminate\Database\Eloquent\Collection {#1141}
                    "field_publication_number" => null
                    "field_publication_type" => Illuminate\Database\Eloquent\Collection {#1142}
                    "field_under_the_edition" => Illuminate\Database\Eloquent\Collection {#1143}
                    "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
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                    "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"
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                      ]
                    ]
                    "field_popular_book" => null
                    "field_recommended_books" => Illuminate\Database\Eloquent\Collection {#1144}
                    "field_new_book" => Illuminate\Database\Eloquent\Collection {#1145}
                    "field_old_book" => Illuminate\Database\Eloquent\Collection {#1146}
                    "field_url" => "/10-klass/algebra/baspasy-pak-uchebnik"
                    "field_cover_color" => Illuminate\Database\Eloquent\Collection {#1147}
                    "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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                    0 => "*"
                  ]
                }
              ]
              #escapeWhenCastingToString: false
            }
            "branch_parent" => Illuminate\Database\Eloquent\Collection {#1148
              #items: []
              #escapeWhenCastingToString: false
            }
          ]
          #original: array:24 [
            "id" => 1119328
            "created_at" => "2026-04-10 13:58:26"
            "updated_at" => null
            "field_display_title" => null
            "field_branch_order" => "1"
            "field_url" => null
            "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1121}
            "field_page_start" => "6"
            "field_branch_display" => "0"
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            "field_display_branch_in_title" => "1"
            "field_display_task_interval" => "0"
            "field_display_branch_page" => "1"
            "field_branch_title_in_content" => "0"
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            "field_metatags_title" => null
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            "field_branch_cover" => array:1 [
              0 => "/media/algebra_10/baspasy-u19/covers/cover1.webp?ts=1752152865"
            ]
            "field_branch_covers" => array:1 [
              0 => array:4 [
                "path" => "/media/algebra_10/baspasy-u19/covers/cover1.webp?ts=1752152865"
                "alt" => ""
                "width" => "1940"
                "height" => "2895"
              ]
            ]
            "book" => Illuminate\Database\Eloquent\Collection {#1150}
            "branch_parent" => Illuminate\Database\Eloquent\Collection {#1148}
          ]
          #changes: []
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          #dateFormat: null
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          #touches: []
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          #hidden: []
          #visible: []
          #fillable: []
          #guarded: array:1 [
            0 => "*"
          ]
        }
        1 => App\Models\Branch {#1149
          #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" => 1119382
            "created_at" => "2026-04-10 13:58:26"
            "updated_at" => null
            "field_display_title" => "Тригонометрические уравнения и неравенства"
            "field_branch_order" => "3"
            "field_url" => null
            "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1154
              #items: array:1 [
                0 => App\Models\Term {#1151
                  #connection: "mysql"
                  #table: "terms"
                  #primaryKey: "id"
                  #keyType: "int"
                  +incrementing: false
                  #with: []
                  #withCount: []
                  +preventsLazyLoading: false
                  #perPage: 15
                  +exists: true
                  +wasRecentlyCreated: false
                  #escapeWhenCastingToString: false
                  #attributes: array:7 [
                    "id" => 29
                    "created_at" => "2026-04-10 13:58:26"
                    "updated_at" => null
                    "name" => "Глава"
                    "field_cases" => array:6 [ …6]
                    "field_page_check_not_needed" => null
                    "field_short_name" => null
                  ]
                  #original: array:7 [
                    "id" => 29
                    "created_at" => "2026-04-10 13:58:26"
                    "updated_at" => null
                    "name" => "Глава"
                    "field_cases" => array:6 [ …6]
                    "field_page_check_not_needed" => null
                    "field_short_name" => null
                  ]
                  #changes: []
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                  #attributeCastCache: []
                  #dateFormat: null
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                  #dispatchesEvents: []
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                  #touches: []
                  +timestamps: true
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                  #hidden: []
                  #visible: []
                  #fillable: []
                  #guarded: array:1 [
                    0 => "*"
                  ]
                }
              ]
              #escapeWhenCastingToString: false
            }
            "field_page_start" => "122"
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            "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 {#1153
              #items: array:1 [
                0 => App\Models\Book {#1120}
              ]
              #escapeWhenCastingToString: false
            }
            "branch_parent" => Illuminate\Database\Eloquent\Collection {#1152
              #items: array:1 [
                0 => App\Models\Branch {#1034}
              ]
              #escapeWhenCastingToString: false
            }
          ]
          #original: array:24 [
            "id" => 1119382
            "created_at" => "2026-04-10 13:58:26"
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            "field_display_title" => "Тригонометрические уравнения и неравенства"
            "field_branch_order" => "3"
            "field_url" => null
            "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1154}
            "field_page_start" => "122"
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            "field_display_branch_page" => "1"
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            "field_branch_cover" => []
            "field_branch_covers" => []
            "book" => Illuminate\Database\Eloquent\Collection {#1153}
            "branch_parent" => Illuminate\Database\Eloquent\Collection {#1152}
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          #touches: []
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          #visible: []
          #fillable: []
          #guarded: array:1 [
            0 => "*"
          ]
        }
        2 => App\Models\Branch {#1155
          #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" => 1119399
            "created_at" => "2026-04-10 13:58:26"
            "updated_at" => null
            "field_display_title" => "Простейшие тригонометрические неравенства"
            "field_branch_order" => "3"
            "field_url" => null
            "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1159
              #items: array:1 [
                0 => App\Models\Term {#1156
                  #connection: "mysql"
                  #table: "terms"
                  #primaryKey: "id"
                  #keyType: "int"
                  +incrementing: false
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                  #withCount: []
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                  #perPage: 15
                  +exists: true
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                  #escapeWhenCastingToString: false
                  #attributes: array:7 [
                    "id" => 32
                    "created_at" => "2026-04-10 13:58:26"
                    "updated_at" => null
                    "name" => "Параграф"
                    "field_cases" => array:6 [ …6]
                    "field_page_check_not_needed" => null
                    "field_short_name" => "§"
                  ]
                  #original: array:7 [
                    "id" => 32
                    "created_at" => "2026-04-10 13:58:26"
                    "updated_at" => null
                    "name" => "Параграф"
                    "field_cases" => array:6 [ …6]
                    "field_page_check_not_needed" => null
                    "field_short_name" => "§"
                  ]
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                  #attributeCastCache: []
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                    0 => "*"
                  ]
                }
              ]
              #escapeWhenCastingToString: false
            }
            "field_page_start" => "157"
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            "field_display_branch_page" => "1"
            "field_branch_title_in_content" => "0"
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            "text" => "<p><strong>10.</strong> (2)</p><p>$ \begin{cases} \text{tg}x \ge \sqrt{3}, \\ \cos x \le \frac{1}{2}. \end{cases} $</p>"
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            "text" => "<p><strong>10.</strong> (2)</p><p>$ \begin{cases} \text{tg}x \ge \sqrt{3}, \\ \cos x \le \frac{1}{2}. \end{cases} $</p>"
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            "edition" => Illuminate\Database\Eloquent\Collection {#1104
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                0 => App\Models\Edition {#1080
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            "text" => "<p>Данная задача представляет собой систему двух тригонометрических неравенств. Для ее решения необходимо найти множества решений для каждого неравенства по отдельности, а затем найти их пересечение.</p><p><strong>Решение неравенства $tg(x) \ge \sqrt{3}$</strong></p><p>Найдем корни уравнения $tg(x) = \sqrt{3}$. Главное значение аргумента, удовлетворяющее этому условию, есть $x = \arctan(\sqrt{3}) = \frac{\pi}{3}$.</p><p>Функция $y = tg(x)$ является возрастающей на всей своей области определения и имеет период $\pi$. Область определения тангенса — все действительные числа, кроме $x = \frac{\pi}{2} + \pi k$, где $k \in \mathbb{Z}$.</p><p>Таким образом, решение неравенства $tg(x) \ge \sqrt{3}$ на одном периоде $(-\frac{\pi}{2}, \frac{\pi}{2})$ есть промежуток $[\frac{\pi}{3}, \frac{\pi}{2})$. С учетом периодичности, общее решение этого неравенства:</p><p><strong>Ответ:</strong> $x \in [\frac{\pi}{3} + \pi k, \frac{\pi}{2} + \pi k)$, где $k \in \mathbb{Z}$.</p><p><strong>Решение неравенства $cos(x) \le \frac{1}{2}$</strong></p><p>Найдем корни уравнения $cos(x) = \frac{1}{2}$. На промежутке $[0, 2\pi]$ решениями являются $x = \arccos(\frac{1}{2}) = \frac{\pi}{3}$ и $x = 2\pi - \frac{\pi}{3} = \frac{5\pi}{3}$.</p><p>Функция $y = cos(x)$ имеет период $2\pi$. Рассматривая единичную окружность или график функции, видим, что значения косинуса не превышают $\frac{1}{2}$ на дуге (или интервале) между $\frac{\pi}{3}$ и $\frac{5\pi}{3}$.</p><p>Следовательно, решение неравенства на одном периоде есть отрезок $[\frac{\pi}{3}, \frac{5\pi}{3}]$. Общее решение, учитывая периодичность:</p><p><strong>Ответ:</strong> $x \in [\frac{\pi}{3} + 2\pi n, \frac{5\pi}{3} + 2\pi n]$, где $n \in \mathbb{Z}$.</p><p><strong>Решение системы</strong></p><p>Теперь найдем пересечение полученных множеств решений. Для наглядности рассмотрим решения на промежутке длиной $2\pi$, например от $0$ до $2\pi$.</p><p>1. Решение для $tg(x) \ge \sqrt{3}$ на $[0, 2\pi]$ (соответствует $k=0$ и $k=1$): $[\frac{\pi}{3}, \frac{\pi}{2}) \cup [\frac{4\pi}{3}, \frac{3\pi}{2})$.</p><p>2. Решение для $cos(x) \le \frac{1}{2}$ на $[0, 2\pi]$ (соответствует $n=0$): $[\frac{\pi}{3}, \frac{5\pi}{3}]$.</p><p>Найдем пересечение этих двух множеств:</p><p>$([\frac{\pi}{3}, \frac{\pi}{2}) \cup [\frac{4\pi}{3}, \frac{3\pi}{2})) \cap [\frac{\pi}{3}, \frac{5\pi}{3}]$</p><p>Первый интервал $[\frac{\pi}{3}, \frac{\pi}{2})$ полностью входит в отрезок $[\frac{\pi}{3}, \frac{5\pi}{3}]$, так как $\frac{\pi}{2} < \frac{5\pi}{3}$. Их пересечение равно $[\frac{\pi}{3}, \frac{\pi}{2})$.</p><p>Второй интервал $[\frac{4\pi}{3}, \frac{3\pi}{2})$ также полностью входит в отрезок $[\frac{\pi}{3}, \frac{5\pi}{3}]$, так как $\frac{\pi}{3} < \frac{4\pi}{3}$ и $\frac{3\pi}{2} < \frac{5\pi}{3}$. Их пересечение равно $[\frac{4\pi}{3}, \frac{3\pi}{2})$.</p><p>Таким образом, решение системы на промежутке $[0, 2\pi]$ — это объединение двух интервалов: $[\frac{\pi}{3}, \frac{\pi}{2}) \cup [\frac{4\pi}{3}, \frac{3\pi}{2})$.</p><p>Общее решение системы получается путем добавления к границам найденных интервалов слагаемого $2\pi m$, где $m \in \mathbb{Z}$, так как период решения системы равен $2\pi$.</p><p><strong>Ответ:</strong> $x \in [\frac{\pi}{3} + 2\pi m, \frac{\pi}{2} + 2\pi m) \cup [\frac{4\pi}{3} + 2\pi m, \frac{3\pi}{2} + 2\pi m)$, где $m \in \mathbb{Z}$.</p>"
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            "text" => "<p>Данная задача представляет собой систему двух тригонометрических неравенств. Для ее решения необходимо найти множества решений для каждого неравенства по отдельности, а затем найти их пересечение.</p><p><strong>Решение неравенства $tg(x) \ge \sqrt{3}$</strong></p><p>Найдем корни уравнения $tg(x) = \sqrt{3}$. Главное значение аргумента, удовлетворяющее этому условию, есть $x = \arctan(\sqrt{3}) = \frac{\pi}{3}$.</p><p>Функция $y = tg(x)$ является возрастающей на всей своей области определения и имеет период $\pi$. Область определения тангенса — все действительные числа, кроме $x = \frac{\pi}{2} + \pi k$, где $k \in \mathbb{Z}$.</p><p>Таким образом, решение неравенства $tg(x) \ge \sqrt{3}$ на одном периоде $(-\frac{\pi}{2}, \frac{\pi}{2})$ есть промежуток $[\frac{\pi}{3}, \frac{\pi}{2})$. С учетом периодичности, общее решение этого неравенства:</p><p><strong>Ответ:</strong> $x \in [\frac{\pi}{3} + \pi k, \frac{\pi}{2} + \pi k)$, где $k \in \mathbb{Z}$.</p><p><strong>Решение неравенства $cos(x) \le \frac{1}{2}$</strong></p><p>Найдем корни уравнения $cos(x) = \frac{1}{2}$. На промежутке $[0, 2\pi]$ решениями являются $x = \arccos(\frac{1}{2}) = \frac{\pi}{3}$ и $x = 2\pi - \frac{\pi}{3} = \frac{5\pi}{3}$.</p><p>Функция $y = cos(x)$ имеет период $2\pi$. Рассматривая единичную окружность или график функции, видим, что значения косинуса не превышают $\frac{1}{2}$ на дуге (или интервале) между $\frac{\pi}{3}$ и $\frac{5\pi}{3}$.</p><p>Следовательно, решение неравенства на одном периоде есть отрезок $[\frac{\pi}{3}, \frac{5\pi}{3}]$. Общее решение, учитывая периодичность:</p><p><strong>Ответ:</strong> $x \in [\frac{\pi}{3} + 2\pi n, \frac{5\pi}{3} + 2\pi n]$, где $n \in \mathbb{Z}$.</p><p><strong>Решение системы</strong></p><p>Теперь найдем пересечение полученных множеств решений. Для наглядности рассмотрим решения на промежутке длиной $2\pi$, например от $0$ до $2\pi$.</p><p>1. Решение для $tg(x) \ge \sqrt{3}$ на $[0, 2\pi]$ (соответствует $k=0$ и $k=1$): $[\frac{\pi}{3}, \frac{\pi}{2}) \cup [\frac{4\pi}{3}, \frac{3\pi}{2})$.</p><p>2. Решение для $cos(x) \le \frac{1}{2}$ на $[0, 2\pi]$ (соответствует $n=0$): $[\frac{\pi}{3}, \frac{5\pi}{3}]$.</p><p>Найдем пересечение этих двух множеств:</p><p>$([\frac{\pi}{3}, \frac{\pi}{2}) \cup [\frac{4\pi}{3}, \frac{3\pi}{2})) \cap [\frac{\pi}{3}, \frac{5\pi}{3}]$</p><p>Первый интервал $[\frac{\pi}{3}, \frac{\pi}{2})$ полностью входит в отрезок $[\frac{\pi}{3}, \frac{5\pi}{3}]$, так как $\frac{\pi}{2} < \frac{5\pi}{3}$. Их пересечение равно $[\frac{\pi}{3}, \frac{\pi}{2})$.</p><p>Второй интервал $[\frac{4\pi}{3}, \frac{3\pi}{2})$ также полностью входит в отрезок $[\frac{\pi}{3}, \frac{5\pi}{3}]$, так как $\frac{\pi}{3} < \frac{4\pi}{3}$ и $\frac{3\pi}{2} < \frac{5\pi}{3}$. Их пересечение равно $[\frac{4\pi}{3}, \frac{3\pi}{2})$.</p><p>Таким образом, решение системы на промежутке $[0, 2\pi]$ — это объединение двух интервалов: $[\frac{\pi}{3}, \frac{\pi}{2}) \cup [\frac{4\pi}{3}, \frac{3\pi}{2})$.</p><p>Общее решение системы получается путем добавления к границам найденных интервалов слагаемого $2\pi m$, где $m \in \mathbb{Z}$, так как период решения системы равен $2\pi$.</p><p><strong>Ответ:</strong> $x \in [\frac{\pi}{3} + 2\pi m, \frac{\pi}{2} + 2\pi m) \cup [\frac{4\pi}{3} + 2\pi m, \frac{3\pi}{2} + 2\pi m)$, где $m \in \mathbb{Z}$.</p>"
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№10 (с. 175)
Условие. №10 (с. 175)
скриншот условия
Алгебра, 10 класс Учебник, авторы: Пак Олег Владимирович, Ардакулы Дархан, Ескендирова Елена Викторовна, издательство Алматыкітап баспасы, Алматы, 2019, Часть 1, страница 175, номер 10, Условие

10. (2)

$ \begin{cases} \text{tg}x \ge \sqrt{3}, \\ \cos x \le \frac{1}{2}. \end{cases} $

Решение 2 (rus). №10 (с. 175)

Данная задача представляет собой систему двух тригонометрических неравенств. Для ее решения необходимо найти множества решений для каждого неравенства по отдельности, а затем найти их пересечение.

Решение неравенства $tg(x) \ge \sqrt{3}$

Найдем корни уравнения $tg(x) = \sqrt{3}$. Главное значение аргумента, удовлетворяющее этому условию, есть $x = \arctan(\sqrt{3}) = \frac{\pi}{3}$.

Функция $y = tg(x)$ является возрастающей на всей своей области определения и имеет период $\pi$. Область определения тангенса — все действительные числа, кроме $x = \frac{\pi}{2} + \pi k$, где $k \in \mathbb{Z}$.

Таким образом, решение неравенства $tg(x) \ge \sqrt{3}$ на одном периоде $(-\frac{\pi}{2}, \frac{\pi}{2})$ есть промежуток $[\frac{\pi}{3}, \frac{\pi}{2})$. С учетом периодичности, общее решение этого неравенства:

Ответ: $x \in [\frac{\pi}{3} + \pi k, \frac{\pi}{2} + \pi k)$, где $k \in \mathbb{Z}$.

Решение неравенства $cos(x) \le \frac{1}{2}$

Найдем корни уравнения $cos(x) = \frac{1}{2}$. На промежутке $[0, 2\pi]$ решениями являются $x = \arccos(\frac{1}{2}) = \frac{\pi}{3}$ и $x = 2\pi - \frac{\pi}{3} = \frac{5\pi}{3}$.

Функция $y = cos(x)$ имеет период $2\pi$. Рассматривая единичную окружность или график функции, видим, что значения косинуса не превышают $\frac{1}{2}$ на дуге (или интервале) между $\frac{\pi}{3}$ и $\frac{5\pi}{3}$.

Следовательно, решение неравенства на одном периоде есть отрезок $[\frac{\pi}{3}, \frac{5\pi}{3}]$. Общее решение, учитывая периодичность:

Ответ: $x \in [\frac{\pi}{3} + 2\pi n, \frac{5\pi}{3} + 2\pi n]$, где $n \in \mathbb{Z}$.

Решение системы

Теперь найдем пересечение полученных множеств решений. Для наглядности рассмотрим решения на промежутке длиной $2\pi$, например от $0$ до $2\pi$.

1. Решение для $tg(x) \ge \sqrt{3}$ на $[0, 2\pi]$ (соответствует $k=0$ и $k=1$): $[\frac{\pi}{3}, \frac{\pi}{2}) \cup [\frac{4\pi}{3}, \frac{3\pi}{2})$.

2. Решение для $cos(x) \le \frac{1}{2}$ на $[0, 2\pi]$ (соответствует $n=0$): $[\frac{\pi}{3}, \frac{5\pi}{3}]$.

Найдем пересечение этих двух множеств:

$([\frac{\pi}{3}, \frac{\pi}{2}) \cup [\frac{4\pi}{3}, \frac{3\pi}{2})) \cap [\frac{\pi}{3}, \frac{5\pi}{3}]$

Первый интервал $[\frac{\pi}{3}, \frac{\pi}{2})$ полностью входит в отрезок $[\frac{\pi}{3}, \frac{5\pi}{3}]$, так как $\frac{\pi}{2} < \frac{5\pi}{3}$. Их пересечение равно $[\frac{\pi}{3}, \frac{\pi}{2})$.

Второй интервал $[\frac{4\pi}{3}, \frac{3\pi}{2})$ также полностью входит в отрезок $[\frac{\pi}{3}, \frac{5\pi}{3}]$, так как $\frac{\pi}{3} < \frac{4\pi}{3}$ и $\frac{3\pi}{2} < \frac{5\pi}{3}$. Их пересечение равно $[\frac{4\pi}{3}, \frac{3\pi}{2})$.

Таким образом, решение системы на промежутке $[0, 2\pi]$ — это объединение двух интервалов: $[\frac{\pi}{3}, \frac{\pi}{2}) \cup [\frac{4\pi}{3}, \frac{3\pi}{2})$.

Общее решение системы получается путем добавления к границам найденных интервалов слагаемого $2\pi m$, где $m \in \mathbb{Z}$, так как период решения системы равен $2\pi$.

Ответ: $x \in [\frac{\pi}{3} + 2\pi m, \frac{\pi}{2} + 2\pi m) \cup [\frac{4\pi}{3} + 2\pi m, \frac{3\pi}{2} + 2\pi m)$, где $m \in \mathbb{Z}$.

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