$\int \frac{3x^2}{x^6 + 1} dx = $

  • A
    $\log(x^6 + 1) + c$
  • B
    $\tan^{-1}(x^3) + c$
  • C
    $3\tan^{-1}(x^3) + c$
  • D
    $3\tan^{-1}\left(\frac{x^3}{3}\right) + c$

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