`int x^2/(1+(x^3)^2) dx` is equal to

A

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

B

(B) `2/3 tan^-1 x^3 + c`

C

(C) `1/3 tan^-1 x^3 + c`

D

(D) `1/2 tan^-1 x^2 + c`

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