यदि $y = \cot^{-1}\left(\sqrt{\frac{1-\sin x}{1+\sin x}}\right)$ है,तो $\frac{dy}{dx} =$

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

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यदि $y = \tan^{-1} \left\{ \frac{\sqrt{1 + x^2} - \sqrt{1 - x^2}}{\sqrt{1 + x^2} + \sqrt{1 - x^2}} \right\}$, जहाँ $|x| < 1$, तो $\frac{dy}{dx}$ का मान है

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यदि $y = \tan^{-1} \left( \frac{5x - x}{1 + 5x^2} \right) + \tan^{-1} \left( \frac{2/3 + x}{1 - (2/3)x} \right)$,तो $\frac{dy}{dx} =$

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