જો $y = \operatorname{cosec}^{-1}\left[\frac{\sqrt{x}+1}{\sqrt{x}-1}\right] + \cos^{-1}\left[\frac{\sqrt{x}-1}{\sqrt{x}+1}\right]$ હોય,તો $\frac{dy}{dx} = $

  • A
    $0$
  • B
    $1$
  • C
    $\frac{2}{\sqrt{x}+1}$
  • D
    $\frac{1}{2(\sqrt{x}+1)}$

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