If $x = t + \frac{1}{t}$ and $y = t - \frac{1}{t}$,then $\frac{d^2y}{dx^2}$ is equal to

  • A
    $-4t(t^2 - 1)^{-2}$
  • B
    $-4t^3(t^2 - 1)^{-3}$
  • C
    $(t^2 + 1)(t^2 - 1)^{-1}$
  • D
    $-4t^2(t^2 - 1)^{-2}$

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