Предмет: Алгебра, автор: Светик2209

Известно, что sin альфа=0,8 П/2<альфа<П. Найти а) соs альфа; б) sin 2aльфа в)cos 2 альфа. Помогите пожалуйста!))))

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Автор ответа: YuliaYuliaYuliaa

надеюсь все правильно сделала)

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Автор ответа: DayLong

Решение во вложении)))))

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