If cos^2A+cosA=1then sin^2A+sin^4A--------------1cosA=1-cos^2AcosA=sin^2A (sin^A+cos^2A=1)on S.B.Scos^2A=sin^4Aputting this in EQ 1sin^2A+cos^2A=11=1Hence PROVED MARK as BRAINLIEST
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