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

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

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