Номер 6, страница 155, 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 6, страница 155.

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            "text" => "<p><strong>6.</strong> $2 \cos x + \cot x = 0$</p>"
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            "created_at" => "2026-04-10 13:58:26"
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                    "created_at" => "2026-04-10 13:58:26"
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                    "title" => "Решение 2 (rus)"
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            "text" => "<p>Исходное уравнение: $2\cos x + \operatorname{ctg} x = 0$.</p><p>Для решения этого уравнения сначала определим область допустимых значений (ОДЗ). Функция котангенса, $\operatorname{ctg} x = \frac{\cos x}{\sin x}$, не определена, когда ее знаменатель $\sin x$ равен нулю. Условие $\sin x \neq 0$ означает, что $x \neq \pi k$, где $k$ – любое целое число ($k \in \mathbb{Z}$).</p><p>Теперь преобразуем уравнение, заменив $\operatorname{ctg} x$ на отношение $\frac{\cos x}{\sin x}$:</p><p>$2\cos x + \frac{\cos x}{\sin x} = 0$</p><p>Вынесем общий множитель $\cos x$ за скобки:</p><p>$\cos x \left(2 + \frac{1}{\sin x}\right) = 0$</p><p>Произведение равно нулю, если один из множителей равен нулю, а другой при этом имеет смысл. Рассмотрим два возможных случая.</p><p><b>Случай 1:</b> $\cos x = 0$.</p><p>Решением этого простейшего тригонометрического уравнения является серия корней:</p><p>$x = \frac{\pi}{2} + \pi n$, где $n \in \mathbb{Z}$.</p><p>Проверим, удовлетворяют ли эти корни ОДЗ ($x \neq \pi k$). Для значений $x = \frac{\pi}{2} + \pi n$, синус принимает значения $1$ или $-1$, то есть $\sin x \neq 0$. Следовательно, все корни этой серии являются решениями исходного уравнения.</p><p><b>Случай 2:</b> $2 + \frac{1}{\sin x} = 0$.</p><p>Решим это уравнение относительно $\sin x$:</p><p>$\frac{1}{\sin x} = -2$</p><p>$\sin x = -\frac{1}{2}$</p><p>Общее решение этого уравнения записывается как:</p><p>$x = (-1)^{m}\arcsin\left(-\frac{1}{2}\right) + \pi m$, где $m \in \mathbb{Z}$.</p><p>Поскольку $\arcsin\left(-\frac{1}{2}\right) = -\frac{\pi}{6}$, получаем:</p><p>$x = (-1)^{m}\left(-\frac{\pi}{6}\right) + \pi m = (-1)^{m+1}\frac{\pi}{6} + \pi m$, где $m \in \mathbb{Z}$.</p><p>Эти корни также удовлетворяют ОДЗ, так как для них $\sin x = -\frac{1}{2} \neq 0$.</p><p>Объединяя решения, полученные в обоих случаях, мы находим все корни исходного уравнения.</p><p><strong>Ответ:</strong> $x = \frac{\pi}{2} + \pi n, n \in \mathbb{Z}$; $x = (-1)^{m+1}\frac{\pi}{6} + \pi m, m \in \mathbb{Z}$.</p>"
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            "text" => "<p>Исходное уравнение: $2\cos x + \operatorname{ctg} x = 0$.</p><p>Для решения этого уравнения сначала определим область допустимых значений (ОДЗ). Функция котангенса, $\operatorname{ctg} x = \frac{\cos x}{\sin x}$, не определена, когда ее знаменатель $\sin x$ равен нулю. Условие $\sin x \neq 0$ означает, что $x \neq \pi k$, где $k$ – любое целое число ($k \in \mathbb{Z}$).</p><p>Теперь преобразуем уравнение, заменив $\operatorname{ctg} x$ на отношение $\frac{\cos x}{\sin x}$:</p><p>$2\cos x + \frac{\cos x}{\sin x} = 0$</p><p>Вынесем общий множитель $\cos x$ за скобки:</p><p>$\cos x \left(2 + \frac{1}{\sin x}\right) = 0$</p><p>Произведение равно нулю, если один из множителей равен нулю, а другой при этом имеет смысл. Рассмотрим два возможных случая.</p><p><b>Случай 1:</b> $\cos x = 0$.</p><p>Решением этого простейшего тригонометрического уравнения является серия корней:</p><p>$x = \frac{\pi}{2} + \pi n$, где $n \in \mathbb{Z}$.</p><p>Проверим, удовлетворяют ли эти корни ОДЗ ($x \neq \pi k$). Для значений $x = \frac{\pi}{2} + \pi n$, синус принимает значения $1$ или $-1$, то есть $\sin x \neq 0$. Следовательно, все корни этой серии являются решениями исходного уравнения.</p><p><b>Случай 2:</b> $2 + \frac{1}{\sin x} = 0$.</p><p>Решим это уравнение относительно $\sin x$:</p><p>$\frac{1}{\sin x} = -2$</p><p>$\sin x = -\frac{1}{2}$</p><p>Общее решение этого уравнения записывается как:</p><p>$x = (-1)^{m}\arcsin\left(-\frac{1}{2}\right) + \pi m$, где $m \in \mathbb{Z}$.</p><p>Поскольку $\arcsin\left(-\frac{1}{2}\right) = -\frac{\pi}{6}$, получаем:</p><p>$x = (-1)^{m}\left(-\frac{\pi}{6}\right) + \pi m = (-1)^{m+1}\frac{\pi}{6} + \pi m$, где $m \in \mathbb{Z}$.</p><p>Эти корни также удовлетворяют ОДЗ, так как для них $\sin x = -\frac{1}{2} \neq 0$.</p><p>Объединяя решения, полученные в обоих случаях, мы находим все корни исходного уравнения.</p><p><strong>Ответ:</strong> $x = \frac{\pi}{2} + \pi n, n \in \mathbb{Z}$; $x = (-1)^{m+1}\frac{\pi}{6} + \pi m, m \in \mathbb{Z}$.</p>"
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№6 (с. 155)
Условие. №6 (с. 155)
скриншот условия
Алгебра, 10 класс Учебник, авторы: Пак Олег Владимирович, Ардакулы Дархан, Ескендирова Елена Викторовна, издательство Алматыкітап баспасы, Алматы, 2019, Часть 1, страница 155, номер 6, Условие

6. $2 \cos x + \cot x = 0$

Решение 2 (rus). №6 (с. 155)

Исходное уравнение: $2\cos x + \operatorname{ctg} x = 0$.

Для решения этого уравнения сначала определим область допустимых значений (ОДЗ). Функция котангенса, $\operatorname{ctg} x = \frac{\cos x}{\sin x}$, не определена, когда ее знаменатель $\sin x$ равен нулю. Условие $\sin x \neq 0$ означает, что $x \neq \pi k$, где $k$ – любое целое число ($k \in \mathbb{Z}$).

Теперь преобразуем уравнение, заменив $\operatorname{ctg} x$ на отношение $\frac{\cos x}{\sin x}$:

$2\cos x + \frac{\cos x}{\sin x} = 0$

Вынесем общий множитель $\cos x$ за скобки:

$\cos x \left(2 + \frac{1}{\sin x}\right) = 0$

Произведение равно нулю, если один из множителей равен нулю, а другой при этом имеет смысл. Рассмотрим два возможных случая.

Случай 1: $\cos x = 0$.

Решением этого простейшего тригонометрического уравнения является серия корней:

$x = \frac{\pi}{2} + \pi n$, где $n \in \mathbb{Z}$.

Проверим, удовлетворяют ли эти корни ОДЗ ($x \neq \pi k$). Для значений $x = \frac{\pi}{2} + \pi n$, синус принимает значения $1$ или $-1$, то есть $\sin x \neq 0$. Следовательно, все корни этой серии являются решениями исходного уравнения.

Случай 2: $2 + \frac{1}{\sin x} = 0$.

Решим это уравнение относительно $\sin x$:

$\frac{1}{\sin x} = -2$

$\sin x = -\frac{1}{2}$

Общее решение этого уравнения записывается как:

$x = (-1)^{m}\arcsin\left(-\frac{1}{2}\right) + \pi m$, где $m \in \mathbb{Z}$.

Поскольку $\arcsin\left(-\frac{1}{2}\right) = -\frac{\pi}{6}$, получаем:

$x = (-1)^{m}\left(-\frac{\pi}{6}\right) + \pi m = (-1)^{m+1}\frac{\pi}{6} + \pi m$, где $m \in \mathbb{Z}$.

Эти корни также удовлетворяют ОДЗ, так как для них $\sin x = -\frac{1}{2} \neq 0$.

Объединяя решения, полученные в обоих случаях, мы находим все корни исходного уравнения.

Ответ: $x = \frac{\pi}{2} + \pi n, n \in \mathbb{Z}$; $x = (-1)^{m+1}\frac{\pi}{6} + \pi m, m \in \mathbb{Z}$.

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