prove that
cos^4A + sin ^2A = cos ^2A +sin^4a
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1
Answer:
sin^4a-sin^2a
Step-by-step explanation:
cos^4a-cos^2a=sin^4a-sin^2a
cos^2a(cos^2a-1)
-cos^2a(1-cos^2a)
-(1-sin^2a)(sin^2a)
sin^4a-sin^2a
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