Предмет: Математика, автор: Lerok536

sinx=-0.6, п Найти cosx
С подробным решением пожалуйста

Ответы

Автор ответа: gordostdeda

Ответ

+-0,8

Пошаговое объяснение:

sin^2(x)+cos^2(x)=1

cos^2(x)=1-sin^2(x)

cos^2(x)=1-0,36=0,64

cos(x)=0,8/-0,8

знак зависит от того, в какой четверти находится угол. синус отрицательный, значит угол в третьей или четвертой четверти, в 3ей косинус отрицательный, в 4ой косинус положительный.

Lerok536: Там получается: П

Lerok536: П меньше x меньше 3П деленое на 2

Lerok536: Какой знак ставить?

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