Answer- Solve: ∫[2x/(x4+1)] dx

Let x2 t and 2x dx dt dtt21 dt tan-1t c tan-1 x2 c

Question

Solve: ∫[2x/(x4+1)]

A sin^-1 x^2 + c

B tan^-1 x^2 + c

C cot^-1 x^2 + c

D cos^-1 x^2 + c

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