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cos^(4)x-sin4x" is errat to "...

cos^(4)x-sin4x" is errat to "

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(cos^(4) x - sin^(4) x) is equal to

cos^(4)x-sin^(4)x= ……….. .

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F(x)=(sin^(4)x+cos^(4)x)/(|sin x|-|cos x|) Find time period