Предмет: Алгебра, автор: CatandCat

cos 2a если sina= - 0.8 Решите плиззз.

Ответы

Автор ответа: GrettaBrouk

2

сos 2a=1-(2sin*sin a)= 1-1,28=-0,28

CatandCat: Спасибо!!!

GrettaBrouk: пожалуйста)

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