यदि $f(x) = \sin^{-1}\left(\sqrt{\frac{1-x}{2}}\right)$ है,तो $f^{\prime}(x) = $

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

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