If $\sin^{-1}(\tan \frac{\pi}{4}) - \sin^{-1}(\sqrt{\frac{3}{x}}) = \frac{\pi}{6}$, then $x$ is a root of the equation:

  • A
    $x^2 - x - 6 = 0$
  • B
    $x^2 - x - 12 = 0$
  • C
    $x^2 + x - 12 = 0$
  • D
    $x^2 + x - 6 = 0$

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