यदि $y = \cos^2 [\cot^{-1} (\sqrt{\frac{1-x}{1+x}})]$ है, तो $\frac{dy}{dx} = \dots$

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

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