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

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

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