hey Guys please give me answer fast and right answer in notebook I will mark u brainleast
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sin+sin^2=1,sin=1-sin^2,sin=cos^2(on squaring both sides)sin^2=cos^4,1-cos^2=cos^4,cos^4+cos^2=1(hence showed).
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sin+sin^2=1
sin=1-sin^2
sin=cos^2......(sin^2+cos^2=1)
on squaring both sides
sin^2=cos^4
1-cos^2=cos^4
1=cos^4+cos^2
Therefore , cos^2+cos^4=1.....
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