Предмет: Математика, автор: сабрина19992

Упростить выражение sin

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Автор ответа: Trover

sin(a-3П/2)*cos(П-a)+sin(a-П)*sin(П+a) = -sin(3П/2-a)*cos(П-a)-sin(П-a)*sin(П+a) = -(-cos a)*(-cos a)-sin a*(-sin a) = -cos^2a+sin^2a = -(cos^2a-sin^2a) = -cos2a

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