integrate {(sin^4x + cos^4x) / (cos^3x …

Let u = sin x - cos x. du = (sin x + cos x) dx u² = (sin x - cosx)² = 1 - 2 sinx cosx sin x * cos x = (1 - u²)/2............ab hena Q. ko isme covert kro then u will get the final result.........

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