Question

if sin theta + sin square theta equal to 1 then evaluate cos square theta + cos power 4 theta

Answer 1

sin theta + sin square theta =1
= sin θ  =1-sin square θ 
= sin θ = cos square
= sin square θ = cos^4 θ 
=1- cos^2 θ = cos^4 θ 
= cos^2θ + cos^4 θ =1
Hence , cos ^2 θ + cos^ 4 θ = 1

Answer 2

the answer is one


as it is given that sin theta + sin square theta is equal to 1