Предмет: Алгебра, автор: ilyamaligyn789

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Автор ответа: LuciferMotningstar

$1) \: 1+cos\beta +cos\frac{\beta }{2}=cos\frac{\beta }{2}(2cos\frac{\beta }{2}+1)\\\\2) \: 3-tg^2\beta = sec^2\beta +2cos(2\beta)sec^2\beta \\\\3) \: cos\beta -sin\beta sin(2\beta) = cos\beta cos(2\beta)$

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