$2 \sin ^{2} 30^{\circ} \cot 30^{\circ}-3 \cos ^{2} 60^{\circ} \sec ^{2} 30^{\circ} = \dots$

  • A
    $\frac{\sqrt{3}-1}{2}$
  • B
    $\frac{\sqrt{3}-2}{2}$
  • C
    $0$
  • D
    $1$

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