$\int \frac{x^2+1}{x^4-x^2+1} \, dx =$

  • A
    $\tan^{-1}\left(\frac{x^2+1}{2}\right) + c$
  • B
    $\tan^{-1}(x^2) + c$
  • C
    $\tan^{-1}(2x^2-1) + c$
  • D
    $\tan^{-1}\left(\frac{x^2-1}{x}\right) + c$

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