Номер 12, страница 156, 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 2. Методы решения тригонометрических уравнений. 2.4. Метод разложения на множители. Задачи - номер 12, страница 156.

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                    "field_default_folder" => "/algebra_10/baspasy-u19/"
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                    "field_cover_alts" => array:1 [ …1]
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                    "field_recommended_books" => Illuminate\Database\Eloquent\Collection {#1099 …2}
                    "field_new_book" => Illuminate\Database\Eloquent\Collection {#1100 …2}
                    "field_old_book" => Illuminate\Database\Eloquent\Collection {#1101 …2}
                    "field_url" => "/10-klass/algebra/baspasy-pak-uchebnik"
                    "field_cover_color" => Illuminate\Database\Eloquent\Collection {#1102 …2}
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                    0 => "*"
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                }
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              #escapeWhenCastingToString: false
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            "branch_parent" => Illuminate\Database\Eloquent\Collection {#1103
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            "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1073}
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        1 => App\Models\Branch {#1104
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          #table: "branches"
          #primaryKey: "id"
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                  #table: "terms"
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                    "created_at" => "2026-04-10 13:58:26"
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            "book" => Illuminate\Database\Eloquent\Collection {#1107
              #items: array:1 [
                0 => App\Models\Book {#1108
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                0 => App\Models\Branch {#1137
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                    "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1138 …2}
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        }
        2 => App\Models\Branch {#1170
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          #table: "branches"
          #primaryKey: "id"
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            "created_at" => "2026-04-10 13:58:26"
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            "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1171
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                0 => App\Models\Term {#1172
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                  #table: "terms"
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                  #keyType: "int"
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                    "created_at" => "2026-04-10 13:58:26"
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                    "field_short_name" => "§"
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            "field_branch_covers" => []
            "book" => Illuminate\Database\Eloquent\Collection {#1173
              #items: array:1 [
                0 => App\Models\Book {#1174
                  #connection: "mysql"
                  #table: "books"
                  #primaryKey: "id"
                  #keyType: "int"
                  +incrementing: false
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                    "field_subject" => Illuminate\Database\Eloquent\Collection {#1175 …2}
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                    "field_cover" => array:1 [ …1]
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                    "field_recommended_books" => Illuminate\Database\Eloquent\Collection {#1198 …2}
                    "field_new_book" => Illuminate\Database\Eloquent\Collection {#1199 …2}
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                    "field_cover" => array:1 [ …1]
                    "field_cover_alts" => array:1 [ …1]
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                    "field_url" => "/10-klass/algebra/baspasy-pak-uchebnik"
                    "field_cover_color" => Illuminate\Database\Eloquent\Collection {#1201 …2}
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            "branch_parent" => Illuminate\Database\Eloquent\Collection {#1202
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                0 => App\Models\Branch {#1203
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                    "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1204 …2}
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            0 => "*"
          ]
        }
        3 => App\Models\Branch {#1241
          #connection: "mysql"
          #table: "branches"
          #primaryKey: "id"
          #keyType: "int"
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            "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1242
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            "book" => Illuminate\Database\Eloquent\Collection {#1243
              #items: array:1 [
                0 => App\Models\Book {#1244
                  #connection: "mysql"
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                  #primaryKey: "id"
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                    "field_subject" => Illuminate\Database\Eloquent\Collection {#1245 …2}
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                    "field_author" => Illuminate\Database\Eloquent\Collection {#1251 …2}
                    "field_author_foreign" => Illuminate\Database\Eloquent\Collection {#1255 …2}
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                    "field_city" => Illuminate\Database\Eloquent\Collection {#1260 …2}
                    "field_series" => Illuminate\Database\Eloquent\Collection {#1262 …2}
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                    "field_publication_type" => Illuminate\Database\Eloquent\Collection {#1266 …2}
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                    "field_cover" => array:1 [ …1]
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                     …13
                  ]
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            "branch_parent" => Illuminate\Database\Eloquent\Collection {#1272
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                0 => App\Models\Branch {#1273
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                  #attributes: array:24 [ …24]
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            0 => "*"
          ]
        }
        4 => App\Models\Branch {#1316
          #connection: "mysql"
          #table: "branches"
          #primaryKey: "id"
          #keyType: "int"
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            "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1317
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            "book" => Illuminate\Database\Eloquent\Collection {#1318
              #items: array:1 [
                0 => App\Models\Book {#1319
                  #connection: "mysql"
                  #table: "books"
                  #primaryKey: "id"
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                  +incrementing: false
                  #with: []
                  #withCount: []
                  +preventsLazyLoading: false
                  #perPage: 15
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                  #escapeWhenCastingToString: false
                  #attributes: array:50 [ …50]
                  #original: array:50 [ …50]
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                }
              ]
              #escapeWhenCastingToString: false
            }
            "branch_parent" => Illuminate\Database\Eloquent\Collection {#1347
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                0 => App\Models\Branch {#1348
                  #connection: "mysql"
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                  #attributes: array:24 [ …24]
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                  #guarded: array:1 [ …1]
                }
              ]
              #escapeWhenCastingToString: false
            }
          ]
          #original: array:24 [
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            "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1317}
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            "field_h1" => null
            "field_description_top" => null
            "field_description_bottom" => null
            "field_branch_cover" => []
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            "book" => Illuminate\Database\Eloquent\Collection {#1318}
            "branch_parent" => Illuminate\Database\Eloquent\Collection {#1347}
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      #escapeWhenCastingToString: false
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    "content" => Illuminate\Database\Eloquent\Collection {#1395
      #items: array:2 [
        0 => App\Models\Element {#1406
          #connection: "mysql"
          #table: "elements"
          #primaryKey: "id"
          #keyType: "int"
          +incrementing: true
          #with: []
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          +preventsLazyLoading: false
          #perPage: 15
          +exists: true
          +wasRecentlyCreated: false
          #escapeWhenCastingToString: false
          #attributes: array:7 [
            "id" => 1300602
            "created_at" => "2026-04-10 13:58:26"
            "updated_at" => null
            "edition" => Illuminate\Database\Eloquent\Collection {#1415
              #items: array:1 [
                0 => App\Models\Edition {#1407
                  #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 [ …21]
                  #original: array:21 [ …21]
                  #changes: []
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                  #attributeCastCache: []
                  #dateFormat: null
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                  +usesUniqueIds: false
                  #hidden: []
                  #visible: []
                  #fillable: []
                  #guarded: array:1 [ …1]
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              #escapeWhenCastingToString: false
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            "task" => array:2 [
              "refs" => "1119917"
              "type" => "task"
            ]
            "text" => "<p><strong>12.</strong> $3\text{tg}^3 x - 10\text{tg}^2 x + 3\text{tg}x = 0$</p>"
            "img" => array:1 [
              0 => array:5 [
                "name" => "12-1.jpg"
                "alt" => null
                "width" => "711"
                "height" => 136
                "path" => "/media/algebra_10/baspasy-u19/0-3-2-4zad/12-1.webp?ts=1753534664"
              ]
            ]
          ]
          #original: array:7 [
            "id" => 1300602
            "created_at" => "2026-04-10 13:58:26"
            "updated_at" => null
            "edition" => Illuminate\Database\Eloquent\Collection {#1415}
            "task" => array:2 [
              "refs" => "1119917"
              "type" => "task"
            ]
            "text" => "<p><strong>12.</strong> $3\text{tg}^3 x - 10\text{tg}^2 x + 3\text{tg}x = 0$</p>"
            "img" => array:1 [
              0 => array:5 [
                "name" => "12-1.jpg"
                "alt" => null
                "width" => "711"
                "height" => 136
                "path" => "/media/algebra_10/baspasy-u19/0-3-2-4zad/12-1.webp?ts=1753534664"
              ]
            ]
          ]
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          #guarded: array:1 [
            0 => "*"
          ]
        }
        1 => App\Models\Element {#1413
          #connection: "mysql"
          #table: "elements"
          #primaryKey: "id"
          #keyType: "int"
          +incrementing: true
          #with: []
          #withCount: []
          +preventsLazyLoading: false
          #perPage: 15
          +exists: true
          +wasRecentlyCreated: false
          #escapeWhenCastingToString: false
          #attributes: array:6 [
            "id" => 1551638
            "created_at" => "2026-04-10 13:58:26"
            "updated_at" => null
            "edition" => Illuminate\Database\Eloquent\Collection {#1423
              #items: array:1 [
                0 => App\Models\Edition {#1414
                  #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 [ …21]
                  #original: array:21 [ …21]
                  #changes: []
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                  #attributeCastCache: []
                  #dateFormat: null
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                  #touches: []
                  +timestamps: true
                  +usesUniqueIds: false
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                  #fillable: []
                  #guarded: array:1 [ …1]
                }
              ]
              #escapeWhenCastingToString: false
            }
            "task" => array:2 [
              "refs" => "1119917"
              "type" => "task"
            ]
            "text" => "<p>Решим данное тригонометрическое уравнение $3\operatorname{tg}^3 x - 10\operatorname{tg}^2 x + 3\operatorname{tg} x = 0$.</p><p>Данное уравнение является кубическим относительно $\operatorname{tg} x$. Чтобы его решить, введем замену переменной. Пусть $t = \operatorname{tg} x$. Тогда уравнение примет следующий вид:</p><p>$3t^3 - 10t^2 + 3t = 0$</p><p>Вынесем общий множитель $t$ за скобки:</p><p>$t(3t^2 - 10t + 3) = 0$</p><p>Произведение равно нулю тогда и только тогда, когда хотя бы один из множителей равен нулю. Таким образом, мы получаем совокупность двух уравнений:</p><p>1) $t = 0$</p><p>2) $3t^2 - 10t + 3 = 0$</p><p>Решим второе уравнение, которое является квадратным. Для этого найдем дискриминант $D$ по формуле $D = b^2 - 4ac$:</p><p>$D = (-10)^2 - 4 \cdot 3 \cdot 3 = 100 - 36 = 64$</p><p>Так как $D > 0$, уравнение имеет два различных действительных корня. Найдем их по формуле $t = \frac{-b \pm \sqrt{D}}{2a}$:</p><p>$t_1 = \frac{10 + \sqrt{64}}{2 \cdot 3} = \frac{10 + 8}{6} = \frac{18}{6} = 3$</p><p>$t_2 = \frac{10 - \sqrt{64}}{2 \cdot 3} = \frac{10 - 8}{6} = \frac{2}{6} = \frac{1}{3}$</p><p>Итак, мы получили три значения для переменной $t$: $0$, $3$ и $\frac{1}{3}$.</p><p>Теперь необходимо выполнить обратную замену $t = \operatorname{tg} x$ для каждого найденного значения $t$ и решить получившиеся простейшие тригонометрические уравнения.</p><p>При $t = 0$ имеем $\operatorname{tg} x = 0$. Решением является $x = \operatorname{arctg}(0) + \pi n$, что дает $x = \pi n$, где $n \in \mathbb{Z}$.</p><p>При $t = 3$ имеем $\operatorname{tg} x = 3$. Решением является $x = \operatorname{arctg}(3) + \pi k$, где $k \in \mathbb{Z}$.</p><p>При $t = \frac{1}{3}$ имеем $\operatorname{tg} x = \frac{1}{3}$. Решением является $x = \operatorname{arctg}\left(\frac{1}{3}\right) + \pi m$, где $m \in \mathbb{Z}$.</p><p>Все найденные серии корней входят в область допустимых значений функции тангенса ($x \neq \frac{\pi}{2} + \pi l, l \in \mathbb{Z}$).</p><p><strong>Ответ:</strong> $\pi n, n \in \mathbb{Z}$; $\operatorname{arctg}(3) + \pi k, k \in \mathbb{Z}$; $\operatorname{arctg}\left(\frac{1}{3}\right) + \pi m, m \in \mathbb{Z}$.</p>"
          ]
          #original: array:6 [
            "id" => 1551638
            "created_at" => "2026-04-10 13:58:26"
            "updated_at" => null
            "edition" => Illuminate\Database\Eloquent\Collection {#1423}
            "task" => array:2 [
              "refs" => "1119917"
              "type" => "task"
            ]
            "text" => "<p>Решим данное тригонометрическое уравнение $3\operatorname{tg}^3 x - 10\operatorname{tg}^2 x + 3\operatorname{tg} x = 0$.</p><p>Данное уравнение является кубическим относительно $\operatorname{tg} x$. Чтобы его решить, введем замену переменной. Пусть $t = \operatorname{tg} x$. Тогда уравнение примет следующий вид:</p><p>$3t^3 - 10t^2 + 3t = 0$</p><p>Вынесем общий множитель $t$ за скобки:</p><p>$t(3t^2 - 10t + 3) = 0$</p><p>Произведение равно нулю тогда и только тогда, когда хотя бы один из множителей равен нулю. Таким образом, мы получаем совокупность двух уравнений:</p><p>1) $t = 0$</p><p>2) $3t^2 - 10t + 3 = 0$</p><p>Решим второе уравнение, которое является квадратным. Для этого найдем дискриминант $D$ по формуле $D = b^2 - 4ac$:</p><p>$D = (-10)^2 - 4 \cdot 3 \cdot 3 = 100 - 36 = 64$</p><p>Так как $D > 0$, уравнение имеет два различных действительных корня. Найдем их по формуле $t = \frac{-b \pm \sqrt{D}}{2a}$:</p><p>$t_1 = \frac{10 + \sqrt{64}}{2 \cdot 3} = \frac{10 + 8}{6} = \frac{18}{6} = 3$</p><p>$t_2 = \frac{10 - \sqrt{64}}{2 \cdot 3} = \frac{10 - 8}{6} = \frac{2}{6} = \frac{1}{3}$</p><p>Итак, мы получили три значения для переменной $t$: $0$, $3$ и $\frac{1}{3}$.</p><p>Теперь необходимо выполнить обратную замену $t = \operatorname{tg} x$ для каждого найденного значения $t$ и решить получившиеся простейшие тригонометрические уравнения.</p><p>При $t = 0$ имеем $\operatorname{tg} x = 0$. Решением является $x = \operatorname{arctg}(0) + \pi n$, что дает $x = \pi n$, где $n \in \mathbb{Z}$.</p><p>При $t = 3$ имеем $\operatorname{tg} x = 3$. Решением является $x = \operatorname{arctg}(3) + \pi k$, где $k \in \mathbb{Z}$.</p><p>При $t = \frac{1}{3}$ имеем $\operatorname{tg} x = \frac{1}{3}$. Решением является $x = \operatorname{arctg}\left(\frac{1}{3}\right) + \pi m$, где $m \in \mathbb{Z}$.</p><p>Все найденные серии корней входят в область допустимых значений функции тангенса ($x \neq \frac{\pi}{2} + \pi l, l \in \mathbb{Z}$).</p><p><strong>Ответ:</strong> $\pi n, n \in \mathbb{Z}$; $\operatorname{arctg}(3) + \pi k, k \in \mathbb{Z}$; $\operatorname{arctg}\left(\frac{1}{3}\right) + \pi m, m \in \mathbb{Z}$.</p>"
          ]
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    "next" => array:2 [
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    "previous" => array:2 [
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    "book" => Illuminate\Database\Eloquent\Collection {#1444
      #items: array:1 [
        0 => App\Models\Book {#1403
          #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 [
            "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 {#1397
              #items: array:1 [
                0 => App\Models\Term {#1398
                  #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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                  #touches: []
                  +timestamps: true
                  +usesUniqueIds: false
                  #hidden: []
                  #visible: []
                  #fillable: []
                  #guarded: array:1 [ …1]
                }
              ]
              #escapeWhenCastingToString: false
            }
            "field_class" => Illuminate\Database\Eloquent\Collection {#1405
              #items: array:1 [
                0 => App\Models\Term {#1401
                  #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 [ …6]
                  #original: array:6 [ …6]
                  #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_publisher" => Illuminate\Database\Eloquent\Collection {#1399
              #items: array:1 [
                0 => App\Models\Term {#1402
                  #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 [ …6]
                  #original: array:6 [ …6]
                  #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_author" => Illuminate\Database\Eloquent\Collection {#1400
              #items: array:3 [
                0 => App\Models\Term {#1421
                  #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 [ …12]
                  #original: array:12 [ …12]
                  #changes: []
                  #casts: []
                  #classCastCache: []
                  #attributeCastCache: []
                  #dateFormat: null
                  #appends: []
                  #dispatchesEvents: []
                  #observables: []
                  #relations: []
                  #touches: []
                  +timestamps: true
                  +usesUniqueIds: false
                  #hidden: []
                  #visible: []
                  #fillable: []
                  #guarded: array:1 [ …1]
                }
                1 => App\Models\Term {#1422
                  #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 [ …12]
                  #original: array:12 [ …12]
                  #changes: []
                  #casts: []
                  #classCastCache: []
                  #attributeCastCache: []
                  #dateFormat: null
                  #appends: []
                  #dispatchesEvents: []
                  #observables: []
                  #relations: []
                  #touches: []
                  +timestamps: true
                  +usesUniqueIds: false
                  #hidden: []
                  #visible: []
                  #fillable: []
                  #guarded: array:1 [ …1]
                }
                2 => App\Models\Term {#1424
                  #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 [ …12]
                  #original: array:12 [ …12]
                  #changes: []
                  #casts: []
                  #classCastCache: []
                  #attributeCastCache: []
                  #dateFormat: null
                  #appends: []
                  #dispatchesEvents: []
                  #observables: []
                  #relations: []
                  #touches: []
                  +timestamps: true
                  +usesUniqueIds: false
                  #hidden: []
                  #visible: []
                  #fillable: []
                  #guarded: array:1 [ …1]
                }
              ]
              #escapeWhenCastingToString: false
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            "field_author_foreign" => Illuminate\Database\Eloquent\Collection {#1425
              #items: []
              #escapeWhenCastingToString: false
            }
            "field_book_type" => Illuminate\Database\Eloquent\Collection {#1426
              #items: array:1 [
                0 => App\Models\Term {#1427
                  #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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                  #touches: []
                  +timestamps: true
                  +usesUniqueIds: false
                  #hidden: []
                  #visible: []
                  #fillable: []
                  #guarded: array:1 [ …1]
                }
              ]
              #escapeWhenCastingToString: false
            }
            "field_country" => Illuminate\Database\Eloquent\Collection {#1428
              #items: array:1 [
                0 => App\Models\Term {#1429
                  #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 [ …6]
                  #original: array:6 [ …6]
                  #changes: []
                  #casts: []
                  #classCastCache: []
                  #attributeCastCache: []
                  #dateFormat: null
                  #appends: []
                  #dispatchesEvents: []
                  #observables: []
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                  #touches: []
                  +timestamps: true
                  +usesUniqueIds: false
                  #hidden: []
                  #visible: []
                  #fillable: []
                  #guarded: array:1 [ …1]
                }
              ]
              #escapeWhenCastingToString: false
            }
            "field_city" => Illuminate\Database\Eloquent\Collection {#1430
              #items: array:1 [
                0 => App\Models\Term {#1431
                  #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 [ …6]
                  #original: array:6 [ …6]
                  #changes: []
                  #casts: []
                  #classCastCache: []
                  #attributeCastCache: []
                  #dateFormat: null
                  #appends: []
                  #dispatchesEvents: []
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                  #touches: []
                  +timestamps: true
                  +usesUniqueIds: false
                  #hidden: []
                  #visible: []
                  #fillable: []
                  #guarded: array:1 [ …1]
                }
              ]
              #escapeWhenCastingToString: false
            }
            "field_series" => Illuminate\Database\Eloquent\Collection {#1432
              #items: []
              #escapeWhenCastingToString: false
            }
            "field_umk" => Illuminate\Database\Eloquent\Collection {#1433
              #items: []
              #escapeWhenCastingToString: false
            }
            "field_level_of_education" => Illuminate\Database\Eloquent\Collection {#1434
              #items: []
              #escapeWhenCastingToString: false
            }
            "field_standart_of_education" => Illuminate\Database\Eloquent\Collection {#1435
              #items: []
              #escapeWhenCastingToString: false
            }
            "field_publication_number" => null
            "field_publication_type" => Illuminate\Database\Eloquent\Collection {#1436
              #items: []
              #escapeWhenCastingToString: false
            }
            "field_under_the_edition" => Illuminate\Database\Eloquent\Collection {#1437
              #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"
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№12 (с. 156)
Условие. №12 (с. 156)
скриншот условия
Алгебра, 10 класс Учебник, авторы: Пак Олег Владимирович, Ардакулы Дархан, Ескендирова Елена Викторовна, издательство Алматыкітап баспасы, Алматы, 2019, Часть 1, страница 156, номер 12, Условие

12. $3\text{tg}^3 x - 10\text{tg}^2 x + 3\text{tg}x = 0$

Решение 2 (rus). №12 (с. 156)

Решим данное тригонометрическое уравнение $3\operatorname{tg}^3 x - 10\operatorname{tg}^2 x + 3\operatorname{tg} x = 0$.

Данное уравнение является кубическим относительно $\operatorname{tg} x$. Чтобы его решить, введем замену переменной. Пусть $t = \operatorname{tg} x$. Тогда уравнение примет следующий вид:

$3t^3 - 10t^2 + 3t = 0$

Вынесем общий множитель $t$ за скобки:

$t(3t^2 - 10t + 3) = 0$

Произведение равно нулю тогда и только тогда, когда хотя бы один из множителей равен нулю. Таким образом, мы получаем совокупность двух уравнений:

1) $t = 0$

2) $3t^2 - 10t + 3 = 0$

Решим второе уравнение, которое является квадратным. Для этого найдем дискриминант $D$ по формуле $D = b^2 - 4ac$:

$D = (-10)^2 - 4 \cdot 3 \cdot 3 = 100 - 36 = 64$

Так как $D > 0$, уравнение имеет два различных действительных корня. Найдем их по формуле $t = \frac{-b \pm \sqrt{D}}{2a}$:

$t_1 = \frac{10 + \sqrt{64}}{2 \cdot 3} = \frac{10 + 8}{6} = \frac{18}{6} = 3$

$t_2 = \frac{10 - \sqrt{64}}{2 \cdot 3} = \frac{10 - 8}{6} = \frac{2}{6} = \frac{1}{3}$

Итак, мы получили три значения для переменной $t$: $0$, $3$ и $\frac{1}{3}$.

Теперь необходимо выполнить обратную замену $t = \operatorname{tg} x$ для каждого найденного значения $t$ и решить получившиеся простейшие тригонометрические уравнения.

При $t = 0$ имеем $\operatorname{tg} x = 0$. Решением является $x = \operatorname{arctg}(0) + \pi n$, что дает $x = \pi n$, где $n \in \mathbb{Z}$.

При $t = 3$ имеем $\operatorname{tg} x = 3$. Решением является $x = \operatorname{arctg}(3) + \pi k$, где $k \in \mathbb{Z}$.

При $t = \frac{1}{3}$ имеем $\operatorname{tg} x = \frac{1}{3}$. Решением является $x = \operatorname{arctg}\left(\frac{1}{3}\right) + \pi m$, где $m \in \mathbb{Z}$.

Все найденные серии корней входят в область допустимых значений функции тангенса ($x \neq \frac{\pi}{2} + \pi l, l \in \mathbb{Z}$).

Ответ: $\pi n, n \in \mathbb{Z}$; $\operatorname{arctg}(3) + \pi k, k \in \mathbb{Z}$; $\operatorname{arctg}\left(\frac{1}{3}\right) + \pi m, m \in \mathbb{Z}$.

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