$\int \frac{x^4+1}{1+x^6} dx =$

  • A
    $\tan^{-1}(x^3) + \tan^{-1} x + c$
  • B
    $\frac{1}{3} \tan^{-1} x + \tan^{-1} x^3 + c$
  • C
    $3 \tan^{-1} x^3 + \tan^{-1} x + c$
  • D
    $\tan^{-1} x + \frac{1}{3} \tan^{-1} x^3 + c$

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