$\int \frac{x^{2}+1}{x^{4}+x^{2}+1} d x=$

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

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