Предмет: Математика, автор: i52148723

Знайдіть значення соѕ 2а, якщо відомо, що sin a= - 1/4 i 3П/2< a< 2П

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Автор ответа: laramelkonyan0126

1

Пошаговое объяснение:

Используем формулу cos2альфа

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