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

  • A
    $\frac{1}{2(1 + x)\sqrt{x}}$
  • B
    $\frac{1}{(1 + x)\sqrt{x}}$
  • C
    $-\frac{1}{2(1 + x)\sqrt{x}}$
  • D
    इनमें से कोई नहीं

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