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Автор - alicatras74

1-2cos^2b/cosb+sinb=? объясните плиз

Ответ

Проверено экспертом

Автор - kmike21
 frac{1-2cos^2 beta }{cos beta +sin beta }=  frac{(1-cos^2 beta)-cos^2 beta }{cos beta +sin beta }= frac{(sin^2 beta)-cos^2 beta }{cos beta +sin beta }=
=frac{(sin beta-cos beta)(sin beta+cos beta) }{cos beta +sin beta }=sin beta-cos beta

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