Предмет: Математика, автор: bubee

Найдите cos в, если cos а=0,7 и а+в=180

Ответы

Автор ответа: Аноним
1

Дело в том, что cosβ=cos(180-α)=-cosα=-0.7

что следует из формул приведения.

Ответ -0.7

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