$\frac{2 \tan 30^{\circ}}{1-\tan ^{2} 30^{\circ}} = ?$

  • A
    $\tan 60^{\circ}$
  • B
    $\cos 60^{\circ}$
  • C
    $\sin 60^{\circ}$
  • D
    $\sin 30^{\circ}$

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