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July 2022 1 26 Report

ПОМОГИТЕ СРОЧНО С АЛГЕБРОЙ ДАЮ 20 БАЛЛОВ!!!

Напишите в виде произведения. Ещё один пример
[tex]cos \frac{11\pi}{12} + cos \frac{3\pi}{4} [/tex]

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sangers1959

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Ответ:

$5)sin\frac{\pi }{6} -sin\frac{\pi }{9} =2*sin(\frac{\pi }{6} }-\frac{\pi }{9} )*cos(\frac{\pi }{6} +\frac{\pi }{9})=2*sin\frac{\pi }{36} *cos\frac{5\pi }{36} .\\6)sin\alpha -sin(\alpha +\frac{\pi }{3} )=2*sin( -\frac{\pi }{6} )*cos(\alpha +\frac{\pi }{6} )=\\=2*(-\frac{1}{2} )*cos(\alpha +\frac{\pi }{6} )=-cos(\alpha +\frac{\pi }{6}). \\7)cos\frac{11\pi }{12} +cos\frac{3\pi }{4} =2*cos(\frac{5\pi }{6} )*cos(\frac{\pi }{12} )=-2*\frac{\sqrt{3} }{2} *cos\frac{\pi }{12} =-\sqrt{3}*cos\frac{\pi }{12} .$

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