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

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

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