sin⁴a - cos⁴a= sin²a-cos²a
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( sin^2)^2 - (cos^2)^2
( sin^2 + cos^2) ( sin^2 - cos^2)
AS sin^2 + cos^2 = 1
so sin^2 - cos^2
( sin^2 + cos^2) ( sin^2 - cos^2)
AS sin^2 + cos^2 = 1
so sin^2 - cos^2
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sin⁴a - cos⁴a= sin²a-cos²a
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