cos^4 a - sin^4 a is equal to _______
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cos^4A - sin^4A
= (cos^2A + sin^2A)(cos^2A - sin^2A)
= 1 x (cosA + sinA) (cosA - sinA)
= (cosA + sinA) (cosA - sinA) or (cos^2A-sin^2A)
Thanks.
= (cos^2A + sin^2A)(cos^2A - sin^2A)
= 1 x (cosA + sinA) (cosA - sinA)
= (cosA + sinA) (cosA - sinA) or (cos^2A-sin^2A)
Thanks.
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