यदि $f(x)=\cosh ^{-1}\left(\frac{1-x}{1+x}\right)$ सुपरिभाषित है, तो $f^{\prime}(x)=$

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

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