Ans cos^2A+ cosA = 1
Then 1-cos^2A =cosA
cosA =sin^2
Therefore
sin^2A+sin^4A=1
cosA+cos^2=1
Hence proved
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Ans cos^2A+ cosA = 1
Then 1-cos^2A =cosA
cosA =sin^2
Therefore
sin^2A+sin^4A=1
cosA+cos^2=1
Hence proved
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