If $x = t + \frac{1}{t}$ and $y = t - \frac{1}{t}$,then $\frac{dy}{dx} = $

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

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