1-cos2a 2- ______ sin^2a

Question

1-cos2a
2- ______
sin^2a

Answer 1

(1-cos2a)/(2-sin²a)=(1-cos²a+sin²a)/(2-sin²a)=(sin²a+sin²a)/(2-sin²a)=
=2sin²a/(2-sin²a)=2sin²a/(2-1+cos²a)=2sin²a/(1+cos²a)