ans fast along with method
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sin theta+sin^2 theta=1
=>sin theta=1-sin^2 theta
=>sin theta=cos^2 theta.............(1)
So,cos^2 theta+cos^4 theta
=sin theta +sin^2 theta (from equation 1)
=1.(Hence Proved)
=>sin theta=1-sin^2 theta
=>sin theta=cos^2 theta.............(1)
So,cos^2 theta+cos^4 theta
=sin theta +sin^2 theta (from equation 1)
=1.(Hence Proved)
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