જો $y = \sin \left(2 \tan ^{-1} \sqrt{\frac{1-x}{1+x}}\right)$ અને $x = \cos 2 \theta$ હોય,તો $\frac{d y}{d x} =$

  • A
    $\frac{x}{\sqrt{1-x^2}}$
  • B
    $-\cot 2 \theta$
  • C
    $\tan 2 \theta$
  • D
    $\frac{-x}{2 \sqrt{1-x^2}}$

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