$\int \sqrt{\frac{1-x}{1+x}} \, dx = $

  • A
    $\sin^{-1} x - \frac{1}{2}\sqrt{1-x^2} + c$
  • B
    $\sin^{-1} x + \frac{1}{2}\sqrt{1-x^2} + c$
  • C
    $\sin^{-1} x - \sqrt{1-x^2} + c$
  • D
    $\sin^{-1} x + \sqrt{1-x^2} + c$

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