Question

If sina+sin^2a=1than value of cos^2a+cos^4a is

Answer 1

$\sin a+\sin^2a=1\\\\\sin a+1-\cos^2a=1\\\\\sin a-\cos^2a=0\\\\\sin a=\cos^2a\\\\\textsf{So we can say that,}\\\\\sin a+\sin^2a=\cos^2a+\cos^4a=\mathbf {1}$