यदि $y = \sin^{-1} \left[ \frac{\sqrt{1+x} + \sqrt{1-x}}{2} \right]$ है,तो $\frac{dy}{dx} = $

  • A
    $-\frac{1}{2\sqrt{1-x^2}}$
  • B
    $-\frac{1}{2\sqrt{x^2-1}}$
  • C
    $\frac{1}{4\sqrt{1-x^2}}$
  • D
    $-\frac{1}{2\sqrt{1+x}}$

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