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Теңсіздікті шешіңіз: \( 2 \operatorname{tg}(-x)>8 \) \( \frac{\pi}{2}+\pi n
Ask by Guzman Hobbs. in Kazakhstan
Oct 31,2024

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Шешімі жоқ.

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Решите уравнение: \( 2 \operatorname{tg}(-x)>8 \) Решение: Решение уравнения \( 2 \operatorname{tg}(-x)>8 \) можно найти, преобразовав его и используя свойства тригонометрических функций. 1. Преобразуем уравнение: \[ 2 \operatorname{tg}(-x) > 8 \] \[ \operatorname{tg}(-x) > 4 \] 2. Используем свойства тригонометрических функций: \[ \operatorname{tg}(-x) = -\operatorname{tg}(x) \] \[ -\operatorname{tg}(x) > 4 \] \[ \operatorname{tg}(x) < -4 \] 3. Определяем интервалы, в которых функция \(\operatorname{tg}(x)\) принимает значения, меньшие -4: \[ \operatorname{tg}(x) \] принимает значения, меньшие -4 в интервалах: \[ x \in \left(-\frac{\pi}{2} + k\pi, \frac{3\pi}{4} + k\pi\right), \quad k \in \mathbb{Z} \] 4. Однако, уравнение \( \operatorname{tg}(x) < -4 \) не имеет решений в интервалах, где \(\operatorname{tg}(x)\) принимает значения, меньшие -1. Это означает, что уравнение \( 2 \operatorname{tg}(-x) > 8 \) не имеет решений. Таким образом, решение уравнения \( 2 \operatorname{tg}(-x) > 8 \) — это: Шешімі жоқ.

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Алдымен теңсіздікке назар аударайық: \( 2 \operatorname{tg}(-x)>8 \). Оны \( \operatorname{tg}(-x) > 4 \) деп қайта жазуға болады. Тегіс функция ретінде, \( \operatorname{tg}(-x) = -\operatorname{tg}(x) \) болғандықтан, біз: \(-\operatorname{tg}(x) > 4\) аламыз, яғни \( \operatorname{tg}(x) < -4 \). Енді \( \operatorname{tg}(x) < -4 \) шарты орындалатын интервалдарды қарастырайық. Тригонометриялық функцияның периодтылығы бойынша, \( \operatorname{tg}(x) \) функциясы 90 градус сайын қайталанады. Сондықтан, \( -\frac{\pi}{2} < x < -\operatorname{arctg} 4 + \pi n \) деген интервалдарды аламыз. Сондықтан, тапқан шарттарымыз бойынша, шешімдер жиыны: \[ -\operatorname{arctg} 4 + \pi n < x < -\frac{\pi}{2} + \pi n, \quad n \in \mathbb{Z}. \]

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