Question

Cos A + cos square is equal to 1 then find sin square A + sin power 4 A

Answer 1

$\cos( a) + \cos ^{2} (a) = 1 \\ \cos(a ) = 1 - \cos ^{2} (a) \\ \cos(a ) = \sin ^{2} (a) \\ \\ \sin ^{2} (a) + \sin ^{4} (a) = \cos(a) + \cos ^{2} (a) = 1$