$\frac{d}{d x}\left[\cos ^{2}\left(\cot ^{-1} \sqrt{\frac{2+x}{2-x}}\right)\right]$ का मान ज्ञात कीजिए।

  • A
    $\frac{1}{4}$
  • B
    $\frac{1}{2}$
  • C
    $-\frac{1}{2}$
  • D
    $-\frac{3}{4}$

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