Предмет: Алгебра, автор: Lukoshko2013

Cosa*sina=? Чему равно помогите

Ответы

Автор ответа: thapko2002

0

возведём в квадрат.тогда
cos^2a+sin^2a+2cosa*sin=0.25
2cosa*sina=-0.75
cosa*sina=-0.375
всё)

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