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

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

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