help me please
I will mark u as brainliest
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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
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