Номер 7, страница 110, часть 2 - гдз по алгебре 10 класс учебник Пак, Ардакулы

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

Тип: Учебник

Издательство: Алматыкітап баспасы

Год издания: 2019 - 2026

Часть: 2

ISBN: 978-601-01-3958-9

Рекомендовано Министерством образования и науки Республики Казахстан

Часть 2. Глава 6. Применение производной. Параграф 4. Задачи на нахождение экстремумов. Задачи - номер 7, страница 110.

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                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
                            "name" => "Алматыкітап баспасы"
                            "field_cases" => array:6 [ …6]
                            "field_translit" => "almatykitap baspasy"
                          ]
                          #original: array:6 [
                            "id" => 7006
                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
                            "name" => "Алматыкітап баспасы"
                            "field_cases" => array:6 [ …6]
                            "field_translit" => "almatykitap baspasy"
                          ]
                          #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" => Illuminate\Database\Eloquent\Collection {#1192
                      #items: array:3 [
                        0 => App\Models\Term {#1193
                          #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" => 7007
                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
                            "name" => "Пак"
                            "field_bio" => null
                            "field_degree_rp" => null
                            "field_foreign_lang_name" => null
                            "field_foreign_lang_patronymic" => null
                            "field_foreign_lang_surname" => null
                            "field_name" => "Олег"
                            "field_patronymic" => "Владимирович"
                            "field_surname_rp" => null
                          ]
                          #original: array:12 [
                            "id" => 7007
                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
                            "name" => "Пак"
                            "field_bio" => null
                            "field_degree_rp" => null
                            "field_foreign_lang_name" => null
                            "field_foreign_lang_patronymic" => null
                            "field_foreign_lang_surname" => null
                            "field_name" => "Олег"
                            "field_patronymic" => "Владимирович"
                            "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 => "*"
                          ]
                        }
                        1 => App\Models\Term {#1194
                          #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 {#1195
                          #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 {#1196
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "field_book_type" => Illuminate\Database\Eloquent\Collection {#1197
                      #items: array:1 [
                        0 => App\Models\Term {#1198
                          #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 {#1199
                      #items: array:1 [
                        0 => App\Models\Term {#1200
                          #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 {#1201
                      #items: array:1 [
                        0 => App\Models\Term {#1202
                          #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 {#1203
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "field_umk" => Illuminate\Database\Eloquent\Collection {#1204
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "field_level_of_education" => Illuminate\Database\Eloquent\Collection {#1205
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "field_standart_of_education" => Illuminate\Database\Eloquent\Collection {#1206
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "field_publication_number" => null
                    "field_publication_type" => Illuminate\Database\Eloquent\Collection {#1207
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "field_under_the_edition" => Illuminate\Database\Eloquent\Collection {#1208
                      #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 {#1209
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "field_new_book" => Illuminate\Database\Eloquent\Collection {#1210
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "field_old_book" => Illuminate\Database\Eloquent\Collection {#1211
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "field_url" => "/10-klass/algebra/baspasy-pak-uchebnik"
                    "field_cover_color" => Illuminate\Database\Eloquent\Collection {#1212
                      #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 {#1187}
                    "field_class" => Illuminate\Database\Eloquent\Collection {#1188}
                    "field_publisher" => Illuminate\Database\Eloquent\Collection {#1190}
                    "field_author" => Illuminate\Database\Eloquent\Collection {#1192}
                    "field_author_foreign" => Illuminate\Database\Eloquent\Collection {#1196}
                    "field_book_type" => Illuminate\Database\Eloquent\Collection {#1197}
                    "field_country" => Illuminate\Database\Eloquent\Collection {#1199}
                    "field_city" => Illuminate\Database\Eloquent\Collection {#1201}
                    "field_series" => Illuminate\Database\Eloquent\Collection {#1203}
                    "field_umk" => Illuminate\Database\Eloquent\Collection {#1204}
                    "field_level_of_education" => Illuminate\Database\Eloquent\Collection {#1205}
                    "field_standart_of_education" => Illuminate\Database\Eloquent\Collection {#1206}
                    "field_publication_number" => null
                    "field_publication_type" => Illuminate\Database\Eloquent\Collection {#1207}
                    "field_under_the_edition" => Illuminate\Database\Eloquent\Collection {#1208}
                    "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 {#1209}
                    "field_new_book" => Illuminate\Database\Eloquent\Collection {#1210}
                    "field_old_book" => Illuminate\Database\Eloquent\Collection {#1211}
                    "field_url" => "/10-klass/algebra/baspasy-pak-uchebnik"
                    "field_cover_color" => Illuminate\Database\Eloquent\Collection {#1212}
                    "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: []
                  #casts: []
                  #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 {#1213
              #items: []
              #escapeWhenCastingToString: false
            }
          ]
          #original: array:24 [
            "id" => 1119426
            "created_at" => "2026-04-10 13:58:26"
            "updated_at" => null
            "field_display_title" => null
            "field_branch_order" => "2"
            "field_url" => null
            "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1186}
            "field_page_start" => "5"
            "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 {#1215}
            "branch_parent" => Illuminate\Database\Eloquent\Collection {#1213}
          ]
          #changes: []
          #casts: []
          #classCastCache: []
          #attributeCastCache: []
          #dateFormat: null
          #appends: []
          #dispatchesEvents: []
          #observables: []
          #relations: []
          #touches: []
          +timestamps: true
          +usesUniqueIds: false
          #hidden: []
          #visible: []
          #fillable: []
          #guarded: array:1 [
            0 => "*"
          ]
        }
        1 => App\Models\Branch {#1214
          #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" => 1119442
            "created_at" => "2026-04-10 13:58:26"
            "updated_at" => null
            "field_display_title" => "Применение производной"
            "field_branch_order" => "6"
            "field_url" => null
            "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1219
              #items: array:1 [
                0 => App\Models\Term {#1216
                  #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: []
                  #casts: []
                  #classCastCache: []
                  #attributeCastCache: []
                  #dateFormat: null
                  #appends: []
                  #dispatchesEvents: []
                  #observables: []
                  #relations: []
                  #touches: []
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                0 => App\Models\Book {#1185}
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        2 => App\Models\Branch {#1220
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        3 => App\Models\Branch {#1290
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            "branch_parent" => Illuminate\Database\Eloquent\Collection {#1302
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                0 => App\Models\Branch {#1301
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            "text" => "<p>Пусть вершины прямоугольника, лежащие на оси $Ox$, имеют координаты $(-x, 0)$ и $(x, 0)$, где $x \in [0, \pi/2]$. Поскольку функция $y=4 \cos x$ является четной, симметричное расположение вершин относительно оси $Oy$ является необходимым условием для образования прямоугольника.</p><p>Две другие вершины будут лежать на графике функции и иметь координаты $(-x, 4 \cos x)$ и $(x, 4 \cos x)$.</p><p>Стороны такого прямоугольника равны:<br><strong>ширина</strong> $a = x - (-x) = 2x$<br><strong>высота</strong> $b = 4 \cos x$</p><p>Периметр прямоугольника $P$ как функция от $x$ выражается формулой:<br>$P(x) = 2(a+b) = 2(2x + 4 \cos x) = 4x + 8 \cos x$.</p><p>Нам нужно найти максимальное значение функции $P(x)$ на отрезке $[0, \pi/2]$. Для этого найдем производную функции $P(x)$:<br>$P'(x) = (4x + 8 \cos x)' = 4 - 8 \sin x$.</p><p>Приравняем производную к нулю, чтобы найти критические точки:<br>$4 - 8 \sin x = 0$<br>$8 \sin x = 4$<br>$\sin x = \frac{1}{2}$</p><p>На отрезке $[0, \pi/2]$ этому уравнению удовлетворяет единственное значение $x = \frac{\pi}{6}$.</p><p>Чтобы определить, является ли эта точка точкой максимума, исследуем знак производной на интервалах, на которые точка $x = \frac{\pi}{6}$ разбивает отрезок $[0, \pi/2]$.<br>- При $x \in [0, \pi/6)$, например $x=0$, $P'(0) = 4 - 8 \sin 0 = 4 > 0$. Функция $P(x)$ возрастает.<br>- При $x \in (\pi/6, \pi/2]$, например $x=\pi/2$, $P'(\pi/2) = 4 - 8 \sin(\pi/2) = 4 - 8 = -4 < 0$. Функция $P(x)$ убывает.</p><p>Следовательно, в точке $x = \frac{\pi}{6}$ функция $P(x)$ достигает своего наибольшего значения.</p><p>Теперь найдем стороны прямоугольника при $x = \frac{\pi}{6}$:<br><strong>ширина</strong> $a = 2x = 2 \cdot \frac{\pi}{6} = \frac{\pi}{3}$<br><strong>высота</strong> $b = 4 \cos x = 4 \cos(\frac{\pi}{6}) = 4 \cdot \frac{\sqrt{3}}{2} = 2\sqrt{3}$</p><p><strong>Ответ:</strong> стороны прямоугольника с наибольшим периметром равны $\frac{\pi}{3}$ и $2\sqrt{3}$.</p>"
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            "text" => "<p>Пусть вершины прямоугольника, лежащие на оси $Ox$, имеют координаты $(-x, 0)$ и $(x, 0)$, где $x \in [0, \pi/2]$. Поскольку функция $y=4 \cos x$ является четной, симметричное расположение вершин относительно оси $Oy$ является необходимым условием для образования прямоугольника.</p><p>Две другие вершины будут лежать на графике функции и иметь координаты $(-x, 4 \cos x)$ и $(x, 4 \cos x)$.</p><p>Стороны такого прямоугольника равны:<br><strong>ширина</strong> $a = x - (-x) = 2x$<br><strong>высота</strong> $b = 4 \cos x$</p><p>Периметр прямоугольника $P$ как функция от $x$ выражается формулой:<br>$P(x) = 2(a+b) = 2(2x + 4 \cos x) = 4x + 8 \cos x$.</p><p>Нам нужно найти максимальное значение функции $P(x)$ на отрезке $[0, \pi/2]$. Для этого найдем производную функции $P(x)$:<br>$P'(x) = (4x + 8 \cos x)' = 4 - 8 \sin x$.</p><p>Приравняем производную к нулю, чтобы найти критические точки:<br>$4 - 8 \sin x = 0$<br>$8 \sin x = 4$<br>$\sin x = \frac{1}{2}$</p><p>На отрезке $[0, \pi/2]$ этому уравнению удовлетворяет единственное значение $x = \frac{\pi}{6}$.</p><p>Чтобы определить, является ли эта точка точкой максимума, исследуем знак производной на интервалах, на которые точка $x = \frac{\pi}{6}$ разбивает отрезок $[0, \pi/2]$.<br>- При $x \in [0, \pi/6)$, например $x=0$, $P'(0) = 4 - 8 \sin 0 = 4 > 0$. Функция $P(x)$ возрастает.<br>- При $x \in (\pi/6, \pi/2]$, например $x=\pi/2$, $P'(\pi/2) = 4 - 8 \sin(\pi/2) = 4 - 8 = -4 < 0$. Функция $P(x)$ убывает.</p><p>Следовательно, в точке $x = \frac{\pi}{6}$ функция $P(x)$ достигает своего наибольшего значения.</p><p>Теперь найдем стороны прямоугольника при $x = \frac{\pi}{6}$:<br><strong>ширина</strong> $a = 2x = 2 \cdot \frac{\pi}{6} = \frac{\pi}{3}$<br><strong>высота</strong> $b = 4 \cos x = 4 \cos(\frac{\pi}{6}) = 4 \cdot \frac{\sqrt{3}}{2} = 2\sqrt{3}$</p><p><strong>Ответ:</strong> стороны прямоугольника с наибольшим периметром равны $\frac{\pi}{3}$ и $2\sqrt{3}$.</p>"
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№7 (с. 110)
Условие. №7 (с. 110)
скриншот условия
Алгебра, 10 класс Учебник, авторы: Пак Олег Владимирович, Ардакулы Дархан, Ескендирова Елена Викторовна, издательство Алматыкітап баспасы, Алматы, 2019, Часть 2, страница 110, номер 7, Условие
Алгебра, 10 класс Учебник, авторы: Пак Олег Владимирович, Ардакулы Дархан, Ескендирова Елена Викторовна, издательство Алматыкітап баспасы, Алматы, 2019, Часть 2, страница 110, номер 7, Условие (продолжение 2)
7. (3)

Рассматриваются прямоугольники, две вершины которых лежат на оси $Ox$, а две другие – на графике функции $y=4 \cos x$, заданной на отрезке

$x \in \left[-\frac{\pi}{2}; \frac{\pi}{2}\right]$. Среди всех таких прямоугольников найдите стороны того,

который имеет наибольший периметр.

Решение 2 (rus). №7 (с. 110)

Пусть вершины прямоугольника, лежащие на оси $Ox$, имеют координаты $(-x, 0)$ и $(x, 0)$, где $x \in [0, \pi/2]$. Поскольку функция $y=4 \cos x$ является четной, симметричное расположение вершин относительно оси $Oy$ является необходимым условием для образования прямоугольника.

Две другие вершины будут лежать на графике функции и иметь координаты $(-x, 4 \cos x)$ и $(x, 4 \cos x)$.

Стороны такого прямоугольника равны:
ширина $a = x - (-x) = 2x$
высота $b = 4 \cos x$

Периметр прямоугольника $P$ как функция от $x$ выражается формулой:
$P(x) = 2(a+b) = 2(2x + 4 \cos x) = 4x + 8 \cos x$.

Нам нужно найти максимальное значение функции $P(x)$ на отрезке $[0, \pi/2]$. Для этого найдем производную функции $P(x)$:
$P'(x) = (4x + 8 \cos x)' = 4 - 8 \sin x$.

Приравняем производную к нулю, чтобы найти критические точки:
$4 - 8 \sin x = 0$
$8 \sin x = 4$
$\sin x = \frac{1}{2}$

На отрезке $[0, \pi/2]$ этому уравнению удовлетворяет единственное значение $x = \frac{\pi}{6}$.

Чтобы определить, является ли эта точка точкой максимума, исследуем знак производной на интервалах, на которые точка $x = \frac{\pi}{6}$ разбивает отрезок $[0, \pi/2]$.
- При $x \in [0, \pi/6)$, например $x=0$, $P'(0) = 4 - 8 \sin 0 = 4 > 0$. Функция $P(x)$ возрастает.
- При $x \in (\pi/6, \pi/2]$, например $x=\pi/2$, $P'(\pi/2) = 4 - 8 \sin(\pi/2) = 4 - 8 = -4 < 0$. Функция $P(x)$ убывает.

Следовательно, в точке $x = \frac{\pi}{6}$ функция $P(x)$ достигает своего наибольшего значения.

Теперь найдем стороны прямоугольника при $x = \frac{\pi}{6}$:
ширина $a = 2x = 2 \cdot \frac{\pi}{6} = \frac{\pi}{3}$
высота $b = 4 \cos x = 4 \cos(\frac{\pi}{6}) = 4 \cdot \frac{\sqrt{3}}{2} = 2\sqrt{3}$

Ответ: стороны прямоугольника с наибольшим периметром равны $\frac{\pi}{3}$ и $2\sqrt{3}$.

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