If $\sin \theta = \sqrt 3 \cos \theta , - \pi < \theta < 0$, then $\theta = $

  • A

    $ - \frac{{5\pi }}{6}$

  • B

    $ - \frac{{4\pi }}{6}$

  • C

    $\frac{{4\pi }}{6}$

  • D

    $\frac{{5\pi }}{6}$

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