Question

$8 sin^{2} \frac{ \pi }{8} cos^{2} \frac{ \pi }{8} =$

Answer 1

$8 sin^2 \frac{ \pi }{8} cos^2 \frac{ \pi }{8} =2sin^2(2* \frac{ \pi }{8} )=2sin^2 \frac{ \pi }{4} =2*( \frac{ \sqrt{2} }{2} )^2=2* \frac{1}{2} =1$