समाकलन $\int_{1/4}^{3/4} \cos \left(2 \cot^{-1} \sqrt{\frac{1-x}{1+x}}\right) dx$ का मान ज्ञात कीजिए:

  • A
    $-1/2$
  • B
    $1/4$
  • C
    $1/2$
  • D
    $-1/4$

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