cos⁴a-cos²a = sin⁴a- sin²a
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cos^2 a ( cos^2 a - 1)
As cos^2 a - 1 = - sin^2a
So - cos^2 a sin^2 a
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sin^2 a( sin^2 a -1)
- sin^2 a cos^2 a
As cos^2 a - 1 = - sin^2a
So - cos^2 a sin^2 a
Rhs
sin^2 a( sin^2 a -1)
- sin^2 a cos^2 a
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