sin^4 theta-cos^4 theta
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Let Theta equal to A
(sin^2A)^2 - ( cos ^2A )^2
( sin^2A + cos^2A ) ( sin^2A - cos ^2A )
1 ( sin^2A - cos^2A )
1 - cos^2A - cos^2A
1 - 2 cos^2A OR 2sin^2A -1
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