Предмет: Алгебра, автор: valeriaserg

cos60°(cos25°cos35° - sin25°sin35°)

Ответы

Автор ответа: manyny06

cos 60° * cos (25°+35°) = cos 60° * cos 60° =( cos 60° ) ²= (12)² = 14

Автор ответа: valeriaserg

объясните пожалуйста, куда sin пропадает?

Автор ответа: uekmyfhfp

= Cos 60* cos(25+35) = cos 60* cos 60 = 1/2 * 1/2 = 1/4=0,25

Автор ответа: manyny06

есть формула: косинус (альфа + бетта) = косинус альфа умножить на косинус бетта - синус альфа умножить на синус бетта

Автор ответа: valeriaserg

спасибо огромное!)

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