`int(2xtan^-1x^2)/(1+x^4)dx` =

A

(A) `[tan^-1 x^2]^2+c`

B

(B) `1/2[ tan^-1 x^2]^2+c`

C

(C) `2[ tan^-1 x^2]^2+c`

D

(D) None of these

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