Question

This is a "find the value" type question

Answer 1

Answer:

$sin ^{4} \pi \div 8 + sin ^{4} 3\pi \div 8 + \sin ^{4} 5\pi \div 8 + \sin ^{4} 7\pi8$

Taking common sin^4 pi/8

then remaining part is

1+3+5+7 = 16