[tex]cos \frac{3 \pi }{10} *cos \frac{2 \pi }{5} [/tex]. Created by масяня3009. algebra-ru

tex]...

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[tex]cos \frac{3 \pi }{10} *cos \frac{2 \pi }{5} [/tex]

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Artem112

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$cos \frac{3 \pi }{10}cos \frac{2 \pi }{5} = \frac{1}{2} (cos(\frac{3 \pi }{10}+\frac{2 \pi }{5} )+cos(\frac{3 \pi }{10}-\frac{2 \pi }{5} ))=
 \frac{1}{2} (cos\frac{7 \pi }{10}+cos\frac{ \pi }{10})$

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