derivative of cos^2x
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the answer is 2cosxsinx or sin2x
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ddxcos2x=2cosx×ddxcosxddxcos2x2cosxddxcosx
=2cosx×−sinx2cosxsinx
=−2cosxsinx2cosxsinx
=−sin2x.sin2x
=2cosx×−sinx2cosxsinx
=−2cosxsinx2cosxsinx
=−sin2x.sin2x
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