$\int_{0}^{1} \tan^{-1}\left(\frac{2x}{1-x^2}\right) dx =$

  • A
    $\pi - \log 2$
  • B
    $\frac{\pi}{2} - \log 2$
  • C
    $\pi + \log 2$
  • D
    $\frac{\pi}{2} + \log 2$

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