Номер 5, страница 114, 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 4. Преобразования выражений, содержащих обратные тригонометрические функции. Задачи - номер 5, страница 114.

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                    "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" => 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 {#1071}
                    "branch_parent" => Illuminate\Database\Eloquent\Collection {#1100}
                  ]
                  #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" => 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 {#1064}
            "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 {#1066}
            "branch_parent" => Illuminate\Database\Eloquent\Collection {#1067}
          ]
          #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\Branch {#1101
          #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" => 1119378
            "created_at" => "2026-04-10 13:58:26"
            "updated_at" => null
            "field_display_title" => "Преобразования выражений, содержащих обратные тригонометрические функции"
            "field_branch_order" => "4"
            "field_url" => null
            "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1102
              #items: array:1 [
                0 => App\Models\Term {#1103
                  #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" => 32
                    "created_at" => "2026-04-10 13:58:26"
                    "updated_at" => null
                    "name" => "Параграф"
                    "field_cases" => array:6 [
                      "field_accusative_case" => "Параграф"
                      "field_creative_case" => "Параграфом"
                      "field_dative_case" => "Параграфу"
                      "field_genitive_case" => "Параграфа"
                      "field_nominative_case" => "Параграф"
                      "field_prepositional_case" => "Параграфе"
                    ]
                    "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 [
                      "field_accusative_case" => "Параграф"
                      "field_creative_case" => "Параграфом"
                      "field_dative_case" => "Параграфу"
                      "field_genitive_case" => "Параграфа"
                      "field_nominative_case" => "Параграф"
                      "field_prepositional_case" => "Параграфе"
                    ]
                    "field_page_check_not_needed" => null
                    "field_short_name" => "§"
                  ]
                  #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_page_start" => "111"
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            "field_branch_title_in_content" => "0"
            "field_navigation_title" => null
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            "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 {#1104
              #items: array:1 [
                0 => App\Models\Book {#1032}
              ]
              #escapeWhenCastingToString: false
            }
            "branch_parent" => Illuminate\Database\Eloquent\Collection {#1105
              #items: array:1 [
                0 => App\Models\Branch {#1106
                  #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 {#1107
                      #items: array:1 [
                        0 => App\Models\Term {#1108
                          #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 [ …7]
                          #original: array:7 [ …7]
                          #changes: []
                          #casts: []
                          #classCastCache: []
                          #attributeCastCache: []
                          #dateFormat: null
                          #appends: []
                          #dispatchesEvents: []
                          #observables: []
                          #relations: []
                          #touches: []
                          +timestamps: true
                          +usesUniqueIds: false
                          #hidden: []
                          #visible: []
                          #fillable: []
                          #guarded: array:1 [ …1]
                        }
                      ]
                      #escapeWhenCastingToString: false
                    }
                    "field_page_start" => "71"
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                    "field_display_branch_in_title" => "1"
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                    "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 {#1109
                      #items: array:1 [
                        0 => App\Models\Book {#1110
                          #connection: "mysql"
                          #table: "books"
                          #primaryKey: "id"
                          #keyType: "int"
                          +incrementing: false
                          #with: []
                          #withCount: []
                          +preventsLazyLoading: false
                          #perPage: 15
                          +exists: true
                          +wasRecentlyCreated: false
                          #escapeWhenCastingToString: false
                          #attributes: array:50 [ …50]
                          #original: array:50 [ …50]
                          #changes: []
                          #casts: []
                          #classCastCache: []
                          #attributeCastCache: []
                          #dateFormat: null
                          #appends: []
                          #dispatchesEvents: []
                          #observables: []
                          #relations: []
                          #touches: []
                          +timestamps: true
                          +usesUniqueIds: false
                          #hidden: []
                          #visible: []
                          #fillable: []
                          #guarded: array:1 [ …1]
                        }
                      ]
                      #escapeWhenCastingToString: false
                    }
                    "branch_parent" => Illuminate\Database\Eloquent\Collection {#1138
                      #items: array:1 [
                        0 => App\Models\Branch {#1139
                          #connection: "mysql"
                          #table: "branches"
                          #primaryKey: "id"
                          #keyType: "int"
                          +incrementing: true
                          #with: []
                          #withCount: []
                          +preventsLazyLoading: false
                          #perPage: 15
                          +exists: true
                           …20
                        }
                      ]
                      #escapeWhenCastingToString: false
                    }
                  ]
                  #original: array:24 [
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                    "field_display_title" => "Тригонометрические функции"
                    "field_branch_order" => "2"
                    "field_url" => null
                    "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1107}
                    "field_page_start" => "71"
                    "field_branch_display" => "0"
                    "field_branch_expanded" => "0"
                    "field_display_branch_in_title" => "1"
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                    "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 {#1109}
                    "branch_parent" => Illuminate\Database\Eloquent\Collection {#1138}
                  ]
                  #changes: []
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                  #attributeCastCache: []
                  #dateFormat: null
                  #appends: []
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                  #touches: []
                  +timestamps: true
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                  #hidden: []
                  #visible: []
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                  #guarded: array:1 [
                    0 => "*"
                  ]
                }
              ]
              #escapeWhenCastingToString: false
            }
          ]
          #original: array:24 [
            "id" => 1119378
            "created_at" => "2026-04-10 13:58:26"
            "updated_at" => null
            "field_display_title" => "Преобразования выражений, содержащих обратные тригонометрические функции"
            "field_branch_order" => "4"
            "field_url" => null
            "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1102}
            "field_page_start" => "111"
            "field_branch_display" => "0"
            "field_branch_expanded" => "0"
            "field_display_branch_in_title" => "1"
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            "field_branch_title_in_content" => "0"
            "field_navigation_title" => null
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            "field_metatags_description" => null
            "field_h1" => null
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            "field_description_bottom" => null
            "field_branch_cover" => []
            "field_branch_covers" => []
            "book" => Illuminate\Database\Eloquent\Collection {#1104}
            "branch_parent" => Illuminate\Database\Eloquent\Collection {#1105}
          ]
          #changes: []
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          #attributeCastCache: []
          #dateFormat: null
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          #touches: []
          +timestamps: true
          +usesUniqueIds: false
          #hidden: []
          #visible: []
          #fillable: []
          #guarded: array:1 [
            0 => "*"
          ]
        }
        3 => App\Models\Branch {#1172
          #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" => 1119379
            "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 {#1173
              #items: []
              #escapeWhenCastingToString: false
            }
            "field_page_start" => "112"
            "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 {#1174
              #items: array:1 [
                0 => App\Models\Book {#1032}
              ]
              #escapeWhenCastingToString: false
            }
            "branch_parent" => Illuminate\Database\Eloquent\Collection {#1175
              #items: array:1 [
                0 => App\Models\Branch {#1176
                  #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" => 1119378
                    "created_at" => "2026-04-10 13:58:26"
                    "updated_at" => null
                    "field_display_title" => "Преобразования выражений, содержащих обратные тригонометрические функции"
                    "field_branch_order" => "4"
                    "field_url" => null
                    "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1177
                      #items: array:1 [
                        0 => App\Models\Term {#1103}
                      ]
                      #escapeWhenCastingToString: false
                    }
                    "field_page_start" => "111"
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                    "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 {#1178
                      #items: array:1 [
                        0 => App\Models\Book {#1032}
                      ]
                      #escapeWhenCastingToString: false
                    }
                    "branch_parent" => Illuminate\Database\Eloquent\Collection {#1179
                      #items: array:1 [
                        0 => App\Models\Branch {#1106}
                      ]
                      #escapeWhenCastingToString: false
                    }
                  ]
                  #original: array:24 [
                    "id" => 1119378
                    "created_at" => "2026-04-10 13:58:26"
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                    "field_display_title" => "Преобразования выражений, содержащих обратные тригонометрические функции"
                    "field_branch_order" => "4"
                    "field_url" => null
                    "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1177}
                    "field_page_start" => "111"
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                    "field_branch_covers" => []
                    "book" => Illuminate\Database\Eloquent\Collection {#1178}
                    "branch_parent" => Illuminate\Database\Eloquent\Collection {#1179}
                  ]
                  #changes: []
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                  #attributeCastCache: []
                  #dateFormat: null
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                  #touches: []
                  +timestamps: true
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                  #hidden: []
                  #visible: []
                  #fillable: []
                  #guarded: array:1 [
                    0 => "*"
                  ]
                }
              ]
              #escapeWhenCastingToString: false
            }
          ]
          #original: array:24 [
            "id" => 1119379
            "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 {#1173}
            "field_page_start" => "112"
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            "field_metatags_description" => null
            "field_h1" => null
            "field_description_top" => null
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            "field_branch_covers" => []
            "book" => Illuminate\Database\Eloquent\Collection {#1174}
            "branch_parent" => Illuminate\Database\Eloquent\Collection {#1175}
          ]
          #changes: []
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          #attributeCastCache: []
          #dateFormat: null
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          #touches: []
          +timestamps: true
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          #hidden: []
          #visible: []
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          #guarded: array:1 [
            0 => "*"
          ]
        }
      ]
      #escapeWhenCastingToString: false
    }
    "content" => Illuminate\Database\Eloquent\Collection {#1180
      #items: array:2 [
        0 => App\Models\Element {#1181
          #connection: "mysql"
          #table: "elements"
          #primaryKey: "id"
          #keyType: "int"
          +incrementing: true
          #with: []
          #withCount: []
          +preventsLazyLoading: false
          #perPage: 15
          +exists: true
          +wasRecentlyCreated: false
          #escapeWhenCastingToString: false
          #attributes: array:7 [
            "id" => 1300455
            "created_at" => "2026-04-10 13:58:26"
            "updated_at" => null
            "edition" => Illuminate\Database\Eloquent\Collection {#1182
              #items: array:1 [
                0 => App\Models\Edition {#1183
                  #connection: "mysql"
                  #table: "editions"
                  #primaryKey: "id"
                  #keyType: "int"
                  +incrementing: false
                  #with: []
                  #withCount: []
                  +preventsLazyLoading: false
                  #perPage: 15
                  +exists: true
                  +wasRecentlyCreated: false
                  #escapeWhenCastingToString: false
                  #attributes: array:21 [
                    "id" => 4962
                    "created_at" => "2026-04-10 13:58:26"
                    "updated_at" => null
                    "title" => "Условие"
                    "field_order" => "1"
                    "field_publisher" => Illuminate\Database\Eloquent\Collection {#1184
                      #items: array:1 [
                        0 => App\Models\Term {#1185 …30}
                      ]
                      #escapeWhenCastingToString: false
                    }
                    "field_content_type" => "free"
                    "field_content_mode" => "text, image"
                    "field_page_content_mode" => "image"
                    "field_content_text_checked" => null
                    "field_page_content_text_checked" => "0"
                    "field_solution_author" => "Автор"
                    "field_moderator" => "pasha"
                    "field_edition_type" => "statement"
                    "field_root_dir" => "0-"
                    "field_responsible" => Illuminate\Database\Eloquent\Collection {#1186
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "field_comment" => null
                    "field_similar_book" => Illuminate\Database\Eloquent\Collection {#1187
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "field_process_formula" => "katex"
                    "field_edition_group" => Illuminate\Database\Eloquent\Collection {#1188
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "field_content_source" => null
                  ]
                  #original: array:21 [
                    "id" => 4962
                    "created_at" => "2026-04-10 13:58:26"
                    "updated_at" => null
                    "title" => "Условие"
                    "field_order" => "1"
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            "text" => "<p><strong>5. (3)</strong> Докажите, что при допустимых значениях переменной $x$ имеют место следующие тождества:</p><p><strong>a)</strong> $\cos(\arcsin x) = \sqrt{1-x^2}$</p><p><strong>б)</strong> $\operatorname{tg}(\arcsin x) = \frac{x}{\sqrt{1-x^2}}$</p><p><strong>в)</strong> $\sin(\operatorname{arctg} x) = \frac{x}{\sqrt{1+x^2}}$</p>"
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            "text" => "<p><strong>а) Докажите, что $\cos(\arcsin x) = \sqrt{1 - x^2}$</strong></p><p> 1. <em>Определим область допустимых значений (ОДЗ).</em><br> Функция $\arcsin x$ определена для $x \in [-1, 1]$.<br> Выражение в правой части $\sqrt{1 - x^2}$ определено, когда подкоренное выражение неотрицательно: $1 - x^2 \ge 0$, что эквивалентно $x^2 \le 1$, или $x \in [-1, 1]$.<br> Области определения левой и правой частей совпадают.</p><p> 2. <em>Выполним доказательство.</em><br> Пусть $y = \arcsin x$. По определению арксинуса, это означает, что $\sin y = x$ и угол $y$ находится в промежутке $[-\frac{\pi}{2}, \frac{\pi}{2}]$.<br> Нам необходимо найти $\cos y$. Для этого воспользуемся основным тригонометрическим тождеством: $\sin^2 y + \cos^2 y = 1$<br> Выразим из него $\cos^2 y$: $\cos^2 y = 1 - \sin^2 y$<br> Поскольку $y \in [-\frac{\pi}{2}, \frac{\pi}{2}]$, косинус на этом промежутке принимает только неотрицательные значения, то есть $\cos y \ge 0$. Следовательно, при извлечении корня мы выбираем знак "+": $\cos y = \sqrt{1 - \sin^2 y}$<br> Теперь подставим $\sin y = x$: $\cos y = \sqrt{1 - x^2}$<br> Так как $y = \arcsin x$, мы получаем исходное тождество: $\cos(\arcsin x) = \sqrt{1 - x^2}$</p><p><strong>Ответ:</strong> тождество доказано.</p><p><strong>б) Докажите, что $\text{tg}(\arcsin x) = \frac{x}{\sqrt{1 - x^2}}$</strong></p><p> 1. <em>Определим ОДЗ.</em><br> Как и в пункте а), $\arcsin x$ определен при $x \in [-1, 1]$.<br> Однако, в правой части присутствует знаменатель $\sqrt{1 - x^2}$, который не должен быть равен нулю. Это означает, что $1 - x^2 \neq 0$, то есть $x \neq \pm 1$.<br> Кроме того, функция тангенс не определена для углов, равных $\frac{\pi}{2} + \pi k$, где $k$ - целое число. Так как $\arcsin x \in [-\frac{\pi}{2}, \frac{\pi}{2}]$, нам нужно исключить значения $x$, для которых $\arcsin x = \pm\frac{\pi}{2}$. Это происходит при $x = \sin(\pm\frac{\pi}{2}) = \pm 1$.<br> Таким образом, ОДЗ для этого тождества: $x \in (-1, 1)$.</p><p> 2. <em>Выполним доказательство.</em><br> Пусть $y = \arcsin x$. Тогда $\sin y = x$ и $y \in (-\frac{\pi}{2}, \frac{\pi}{2})$.<br> По определению тангенса: $\text{tg} y = \frac{\sin y}{\cos y}$<br> Из предыдущего пункта мы знаем, что $\cos y = \cos(\arcsin x) = \sqrt{1 - x^2}$.<br> Подставим известные значения $\sin y = x$ и $\cos y = \sqrt{1 - x^2}$ в формулу для тангенса: $\text{tg} y = \frac{x}{\sqrt{1 - x^2}}$<br> Заменяя $y$ на $\arcsin x$, получаем: $\text{tg}(\arcsin x) = \frac{x}{\sqrt{1 - x^2}}$</p><p><strong>Ответ:</strong> тождество доказано.</p><p><strong>в) Докажите, что $\sin(\text{arctg} x) = \frac{x}{\sqrt{1 + x^2}}$</strong></p><p> 1. <em>Определим ОДЗ.</em><br> Функция $\text{arctg} x$ определена для всех действительных чисел $x \in (-\infty, \infty)$.<br> Выражение в знаменателе правой части $\sqrt{1 + x^2}$ определено и не равно нулю для любого действительного $x$, так как $1 + x^2 \ge 1$.<br> Следовательно, ОДЗ для этого тождества — все действительные числа, $x \in \mathbb{R}$.</p><p> 2. <em>Выполним доказательство.</em><br> Пусть $y = \text{arctg} x$. По определению арктангенса, это означает, что $\text{tg} y = x$ и $y \in (-\frac{\pi}{2}, \frac{\pi}{2})$.<br> Нам нужно выразить $\sin y$ через $\text{tg} y$. Воспользуемся тригонометрическим тождеством: $1 + \text{tg}^2 y = \sec^2 y = \frac{1}{\cos^2 y}$<br> Отсюда $\cos^2 y = \frac{1}{1 + \text{tg}^2 y}$.<br> Поскольку $y \in (-\frac{\pi}{2}, \frac{\pi}{2})$, то $\cos y > 0$. Следовательно: $\cos y = \sqrt{\frac{1}{1 + \text{tg}^2 y}} = \frac{1}{\sqrt{1 + \text{tg}^2 y}}$<br> Теперь воспользуемся определением тангенса $\text{tg} y = \frac{\sin y}{\cos y}$ чтобы выразить синус: $\sin y = \text{tg} y \cdot \cos y$<br> Подставим найденное выражение для $\cos y$: $\sin y = \text{tg} y \cdot \frac{1}{\sqrt{1 + \text{tg}^2 y}} = \frac{\text{tg} y}{\sqrt{1 + \text{tg}^2 y}}$<br> Теперь подставим $\text{tg} y = x$: $\sin y = \frac{x}{\sqrt{1 + x^2}}$<br> Заменяя $y$ на $\text{arctg} x$, получаем искомое тождество: $\sin(\text{arctg} x) = \frac{x}{\sqrt{1 + x^2}}$</p><p><strong>Ответ:</strong> тождество доказано.</p>"
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            "text" => "<p><strong>а) Докажите, что $\cos(\arcsin x) = \sqrt{1 - x^2}$</strong></p><p> 1. <em>Определим область допустимых значений (ОДЗ).</em><br> Функция $\arcsin x$ определена для $x \in [-1, 1]$.<br> Выражение в правой части $\sqrt{1 - x^2}$ определено, когда подкоренное выражение неотрицательно: $1 - x^2 \ge 0$, что эквивалентно $x^2 \le 1$, или $x \in [-1, 1]$.<br> Области определения левой и правой частей совпадают.</p><p> 2. <em>Выполним доказательство.</em><br> Пусть $y = \arcsin x$. По определению арксинуса, это означает, что $\sin y = x$ и угол $y$ находится в промежутке $[-\frac{\pi}{2}, \frac{\pi}{2}]$.<br> Нам необходимо найти $\cos y$. Для этого воспользуемся основным тригонометрическим тождеством: $\sin^2 y + \cos^2 y = 1$<br> Выразим из него $\cos^2 y$: $\cos^2 y = 1 - \sin^2 y$<br> Поскольку $y \in [-\frac{\pi}{2}, \frac{\pi}{2}]$, косинус на этом промежутке принимает только неотрицательные значения, то есть $\cos y \ge 0$. Следовательно, при извлечении корня мы выбираем знак "+": $\cos y = \sqrt{1 - \sin^2 y}$<br> Теперь подставим $\sin y = x$: $\cos y = \sqrt{1 - x^2}$<br> Так как $y = \arcsin x$, мы получаем исходное тождество: $\cos(\arcsin x) = \sqrt{1 - x^2}$</p><p><strong>Ответ:</strong> тождество доказано.</p><p><strong>б) Докажите, что $\text{tg}(\arcsin x) = \frac{x}{\sqrt{1 - x^2}}$</strong></p><p> 1. <em>Определим ОДЗ.</em><br> Как и в пункте а), $\arcsin x$ определен при $x \in [-1, 1]$.<br> Однако, в правой части присутствует знаменатель $\sqrt{1 - x^2}$, который не должен быть равен нулю. Это означает, что $1 - x^2 \neq 0$, то есть $x \neq \pm 1$.<br> Кроме того, функция тангенс не определена для углов, равных $\frac{\pi}{2} + \pi k$, где $k$ - целое число. Так как $\arcsin x \in [-\frac{\pi}{2}, \frac{\pi}{2}]$, нам нужно исключить значения $x$, для которых $\arcsin x = \pm\frac{\pi}{2}$. Это происходит при $x = \sin(\pm\frac{\pi}{2}) = \pm 1$.<br> Таким образом, ОДЗ для этого тождества: $x \in (-1, 1)$.</p><p> 2. <em>Выполним доказательство.</em><br> Пусть $y = \arcsin x$. Тогда $\sin y = x$ и $y \in (-\frac{\pi}{2}, \frac{\pi}{2})$.<br> По определению тангенса: $\text{tg} y = \frac{\sin y}{\cos y}$<br> Из предыдущего пункта мы знаем, что $\cos y = \cos(\arcsin x) = \sqrt{1 - x^2}$.<br> Подставим известные значения $\sin y = x$ и $\cos y = \sqrt{1 - x^2}$ в формулу для тангенса: $\text{tg} y = \frac{x}{\sqrt{1 - x^2}}$<br> Заменяя $y$ на $\arcsin x$, получаем: $\text{tg}(\arcsin x) = \frac{x}{\sqrt{1 - x^2}}$</p><p><strong>Ответ:</strong> тождество доказано.</p><p><strong>в) Докажите, что $\sin(\text{arctg} x) = \frac{x}{\sqrt{1 + x^2}}$</strong></p><p> 1. <em>Определим ОДЗ.</em><br> Функция $\text{arctg} x$ определена для всех действительных чисел $x \in (-\infty, \infty)$.<br> Выражение в знаменателе правой части $\sqrt{1 + x^2}$ определено и не равно нулю для любого действительного $x$, так как $1 + x^2 \ge 1$.<br> Следовательно, ОДЗ для этого тождества — все действительные числа, $x \in \mathbb{R}$.</p><p> 2. <em>Выполним доказательство.</em><br> Пусть $y = \text{arctg} x$. По определению арктангенса, это означает, что $\text{tg} y = x$ и $y \in (-\frac{\pi}{2}, \frac{\pi}{2})$.<br> Нам нужно выразить $\sin y$ через $\text{tg} y$. Воспользуемся тригонометрическим тождеством: $1 + \text{tg}^2 y = \sec^2 y = \frac{1}{\cos^2 y}$<br> Отсюда $\cos^2 y = \frac{1}{1 + \text{tg}^2 y}$.<br> Поскольку $y \in (-\frac{\pi}{2}, \frac{\pi}{2})$, то $\cos y > 0$. Следовательно: $\cos y = \sqrt{\frac{1}{1 + \text{tg}^2 y}} = \frac{1}{\sqrt{1 + \text{tg}^2 y}}$<br> Теперь воспользуемся определением тангенса $\text{tg} y = \frac{\sin y}{\cos y}$ чтобы выразить синус: $\sin y = \text{tg} y \cdot \cos y$<br> Подставим найденное выражение для $\cos y$: $\sin y = \text{tg} y \cdot \frac{1}{\sqrt{1 + \text{tg}^2 y}} = \frac{\text{tg} y}{\sqrt{1 + \text{tg}^2 y}}$<br> Теперь подставим $\text{tg} y = x$: $\sin y = \frac{x}{\sqrt{1 + x^2}}$<br> Заменяя $y$ на $\text{arctg} x$, получаем искомое тождество: $\sin(\text{arctg} x) = \frac{x}{\sqrt{1 + x^2}}$</p><p><strong>Ответ:</strong> тождество доказано.</p>"
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№5 (с. 114)
Условие. №5 (с. 114)
скриншот условия
Алгебра, 10 класс Учебник, авторы: Пак Олег Владимирович, Ардакулы Дархан, Ескендирова Елена Викторовна, издательство Алматыкітап баспасы, Алматы, 2019, Часть 1, страница 114, номер 5, Условие

5. (3) Докажите, что при допустимых значениях переменной $x$ имеют место следующие тождества:

a) $\cos(\arcsin x) = \sqrt{1-x^2}$

б) $\operatorname{tg}(\arcsin x) = \frac{x}{\sqrt{1-x^2}}$

в) $\sin(\operatorname{arctg} x) = \frac{x}{\sqrt{1+x^2}}$

Решение 2 (rus). №5 (с. 114)

а) Докажите, что $\cos(\arcsin x) = \sqrt{1 - x^2}$

1. Определим область допустимых значений (ОДЗ).
Функция $\arcsin x$ определена для $x \in [-1, 1]$.
Выражение в правой части $\sqrt{1 - x^2}$ определено, когда подкоренное выражение неотрицательно: $1 - x^2 \ge 0$, что эквивалентно $x^2 \le 1$, или $x \in [-1, 1]$.
Области определения левой и правой частей совпадают.

2. Выполним доказательство.
Пусть $y = \arcsin x$. По определению арксинуса, это означает, что $\sin y = x$ и угол $y$ находится в промежутке $[-\frac{\pi}{2}, \frac{\pi}{2}]$.
Нам необходимо найти $\cos y$. Для этого воспользуемся основным тригонометрическим тождеством: $\sin^2 y + \cos^2 y = 1$
Выразим из него $\cos^2 y$: $\cos^2 y = 1 - \sin^2 y$
Поскольку $y \in [-\frac{\pi}{2}, \frac{\pi}{2}]$, косинус на этом промежутке принимает только неотрицательные значения, то есть $\cos y \ge 0$. Следовательно, при извлечении корня мы выбираем знак "+": $\cos y = \sqrt{1 - \sin^2 y}$
Теперь подставим $\sin y = x$: $\cos y = \sqrt{1 - x^2}$
Так как $y = \arcsin x$, мы получаем исходное тождество: $\cos(\arcsin x) = \sqrt{1 - x^2}$

Ответ: тождество доказано.

б) Докажите, что $\text{tg}(\arcsin x) = \frac{x}{\sqrt{1 - x^2}}$

1. Определим ОДЗ.
Как и в пункте а), $\arcsin x$ определен при $x \in [-1, 1]$.
Однако, в правой части присутствует знаменатель $\sqrt{1 - x^2}$, который не должен быть равен нулю. Это означает, что $1 - x^2 \neq 0$, то есть $x \neq \pm 1$.
Кроме того, функция тангенс не определена для углов, равных $\frac{\pi}{2} + \pi k$, где $k$ - целое число. Так как $\arcsin x \in [-\frac{\pi}{2}, \frac{\pi}{2}]$, нам нужно исключить значения $x$, для которых $\arcsin x = \pm\frac{\pi}{2}$. Это происходит при $x = \sin(\pm\frac{\pi}{2}) = \pm 1$.
Таким образом, ОДЗ для этого тождества: $x \in (-1, 1)$.

2. Выполним доказательство.
Пусть $y = \arcsin x$. Тогда $\sin y = x$ и $y \in (-\frac{\pi}{2}, \frac{\pi}{2})$.
По определению тангенса: $\text{tg} y = \frac{\sin y}{\cos y}$
Из предыдущего пункта мы знаем, что $\cos y = \cos(\arcsin x) = \sqrt{1 - x^2}$.
Подставим известные значения $\sin y = x$ и $\cos y = \sqrt{1 - x^2}$ в формулу для тангенса: $\text{tg} y = \frac{x}{\sqrt{1 - x^2}}$
Заменяя $y$ на $\arcsin x$, получаем: $\text{tg}(\arcsin x) = \frac{x}{\sqrt{1 - x^2}}$

Ответ: тождество доказано.

в) Докажите, что $\sin(\text{arctg} x) = \frac{x}{\sqrt{1 + x^2}}$

1. Определим ОДЗ.
Функция $\text{arctg} x$ определена для всех действительных чисел $x \in (-\infty, \infty)$.
Выражение в знаменателе правой части $\sqrt{1 + x^2}$ определено и не равно нулю для любого действительного $x$, так как $1 + x^2 \ge 1$.
Следовательно, ОДЗ для этого тождества — все действительные числа, $x \in \mathbb{R}$.

2. Выполним доказательство.
Пусть $y = \text{arctg} x$. По определению арктангенса, это означает, что $\text{tg} y = x$ и $y \in (-\frac{\pi}{2}, \frac{\pi}{2})$.
Нам нужно выразить $\sin y$ через $\text{tg} y$. Воспользуемся тригонометрическим тождеством: $1 + \text{tg}^2 y = \sec^2 y = \frac{1}{\cos^2 y}$
Отсюда $\cos^2 y = \frac{1}{1 + \text{tg}^2 y}$.
Поскольку $y \in (-\frac{\pi}{2}, \frac{\pi}{2})$, то $\cos y > 0$. Следовательно: $\cos y = \sqrt{\frac{1}{1 + \text{tg}^2 y}} = \frac{1}{\sqrt{1 + \text{tg}^2 y}}$
Теперь воспользуемся определением тангенса $\text{tg} y = \frac{\sin y}{\cos y}$ чтобы выразить синус: $\sin y = \text{tg} y \cdot \cos y$
Подставим найденное выражение для $\cos y$: $\sin y = \text{tg} y \cdot \frac{1}{\sqrt{1 + \text{tg}^2 y}} = \frac{\text{tg} y}{\sqrt{1 + \text{tg}^2 y}}$
Теперь подставим $\text{tg} y = x$: $\sin y = \frac{x}{\sqrt{1 + x^2}}$
Заменяя $y$ на $\text{arctg} x$, получаем искомое тождество: $\sin(\text{arctg} x) = \frac{x}{\sqrt{1 + x^2}}$

Ответ: тождество доказано.

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