Вычислить а)16cos[tex] \frac{ \pi }{9} [/tex]cos[tex] \frac{2\pi }{9} [/tex]cos[tex] \frac{4 \pi }{9} [/tex]
b)sin[tex] \frac{3 \pi }{14} [/tex] - sin[tex] \frac{ \pi }{14} [/tex]-sin[tex] \frac{ 5 \pi }{14} [/tex]
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