$\int_0^1 \sqrt{\frac{1-x}{1+x}} \, dx =$

  • A
    $\frac{\pi}{4}+1$
  • B
    $\frac{\pi}{2}+1$
  • C
    $\frac{\pi}{4}-1$
  • D
    $\frac{\pi}{2}-1$

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