$\lim _{x \rightarrow \pi / 6} \left[ \frac{3 \sin x - \sqrt{3} \cos x}{6 x - \pi} \right]$ is equal to :

  • A
    $\sqrt{3}$
  • B
    $\frac{1}{\sqrt{3}}$
  • C
    $\frac{1}{3}$
  • D
    $-\frac{1}{3}$

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