$\frac{d}{d x}\left(\cos ^{-1}\left(\frac{x-\frac{1}{x}}{x+\frac{1}{x}}\right)\right)=$

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

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