$\frac{\cot ^2 15^{\circ}-1}{\cot ^2 15^{\circ}+1} = $

  • A
    $\frac{1}{2}$
  • B
    $\frac{\sqrt{3}}{2}$
  • C
    $\frac{3 \sqrt{3}}{4}$
  • D
    $\frac{\sqrt{3}}{4}$

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