यदि $y(x) = \cot^{-1}\left(\frac{\sqrt{1+\sin x} + \sqrt{1-\sin x}}{\sqrt{1+\sin x} - \sqrt{1-\sin x}}\right)$,जहाँ $x \in \left(\frac{\pi}{2}, \pi\right)$,तो $x = \frac{5\pi}{6}$ पर $\frac{dy}{dx}$ का मान ज्ञात कीजिए।

  • A
    $-\frac{1}{2}$
  • B
    $-1$
  • C
    $\frac{1}{2}$
  • D
    $0$

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