Is this question done in a right way. My frnds pls tell
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Answer: If it sinx , that's right way.............
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Cos^4A - Cos^2A
= Cos^2A*(Cos^2A - 1)
= Cos^2A*(- Sin^2A)
= (1 - Sin^2A)*(- Sin^2A)
= - Sin^2A + Sin^4A
= Sin^4A - Sin^2A
Hence Proved.
= Cos^2A*(Cos^2A - 1)
= Cos^2A*(- Sin^2A)
= (1 - Sin^2A)*(- Sin^2A)
= - Sin^2A + Sin^4A
= Sin^4A - Sin^2A
Hence Proved.
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