Предмет: Алгебра, автор: motorinaevgenia

Cosx= - корень2/2 решите уравнение

serd2011: Это табличное значение. x = 135 градусов

nikebod313: Функция косинус является периодической, поэтому x = 135° — не единственное решение данного уравнения.

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Автор ответа: nikebod313

Решите уравнение $\cos x = -\dfrac{\sqrt{2}}{2}$

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