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

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

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