यदि $y=\sec ^{-1}\left(\frac{x+x^{-1}}{x-x^{-1}}\right)$ है,तो $\frac{d y}{d x}=$

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

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