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

  • A
    $\frac{2}{\sqrt{3}} \log \left(\frac{2x+1+\sqrt{3}}{2x-1-\sqrt{3}}\right)+c$
  • B
    $\frac{1}{\sqrt{3}} \log \left(\frac{2x+1-\sqrt{3}}{2x+1+\sqrt{3}}\right)+c$
  • C
    $\frac{2}{\sqrt{3}} \tan^{-1}\left(\frac{2x+1}{\sqrt{3}}\right)+c$
  • D
    $\frac{2}{\sqrt{5}} \tan^{-1}\left(\frac{2x+1}{\sqrt{5}}\right)+c$

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