Question

вычислите 8(sinпи/12cosпи/12-1)

Answer 1

$8(sin( \frac{\pi}{12})cos( \frac{\pi}{12})-1)=4(2sin( \frac{\pi}{12})cos( \frac{\pi}{12})-2)=4(sin( \frac{\pi}{6})-2)=\\=4( \frac{1}{2}-2)=-6$