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Integral of the form int[xf\'(x)+f(x)]dx...

Integral of the form `int[xf\'(x)+f(x)]dx` can be evaluated by using integration by parts in first integral and leaving second integral as it is.Now answer the question:`int[1/(x^4+1)-(4x^4)/(x^4+1)^2]dx=` (A) `x^2/(x^4+1)+c` (B) `x^3/(x^4+1)+c` (C) `x/(x^4+1)+c` (D) none of these

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