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  4. 3[ sin x - cos x]4 + 6[ sin x + cos x]2 + 4[ sin6 x + cos6 x] =

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Q. $3[\sin x -\cos x]^4 + 6[\sin x + \cos x]^2 + 4[\sin^6 x + \cos^6 x] =$

Trigonometric Functions

Solution:

Put $x = 90^\circ$