Question

help me please
I will mark u as brainliest​

Answer 1

Step-by-step explanation:

cos^2x+2(cos^2x*cos^2 60°+sin^2x*sin^2 60°)

=cos^2 x+2(cos^2 x*1/4+sin^2x*3/4)

=cos^2x+2(cos^2/4+3sin^2/4)

=cos^2x+1/2(cos^2+3sin^2)

=2cos^2x+(1+2sin^2)/2

=2cos^2+1+2sin^2/2

=1+2/2

=3/2