$\int_0^1 \sqrt{\frac{1-x}{1+x}} \,dx$ का मान ज्ञात कीजिए।

  • A
    $\left(\frac{\pi}{2} - 1\right)$
  • B
    $\left(\frac{\pi}{2} + 1\right)$
  • C
    $\frac{\pi}{2}$
  • D
    $(\pi + 1)$

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