Question

If sintheta+sin2theta=1 then find the value of cos2theta+cos4theta.

Note:2 and 4 are the powers.

Answer 1

Hii There!!


Here in the question we have to find the value of:-

cos2thetha + cos4 theta

=) cos2 theta + cos4 theta

=) 1-sin2 theta+ cos2 theta × cos2theta

=) sin theta + (1-sin2 theta) (1-sin2 theta)

=) sin theta + sin theta× sin theta

=) sin theta + sin2 theta

=) 1


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