If $\alpha$ and $\beta$ are roots of the equation $x^2+5|x|-6=0$,then the value of $|\tan^{-1} \alpha - \tan^{-1} \beta|$ is

  • A
    $\frac{\pi}{2}$
  • B
    $0$
  • C
    $\pi$
  • D
    $\frac{\pi}{4}$

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