show that cospower4 theta-sinpower4 theta
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cos^4 - sin^4 =
(cos^2 - sin^2) (cos^2 + sin^2)
= cos^2 - sin^2
= 1 - 2sin^2
= 2cos^2 - 1
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Answer:
The ans is not complete...
But by simplifying it comes out to be
(cos θ + sin θ)(cos θ - sin θ)
Step-by-step explanation:
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