$\cos \frac{\pi}{12} = ?$

  • A
    $\frac{\sqrt{2}-\sqrt{3}}{2}$
  • B
    $\frac{\sqrt{2}+\sqrt{3}}{2}$
  • C
    $\frac{\sqrt{2}-\sqrt{6}}{4}$
  • D
    $\frac{\sqrt{2}+\sqrt{6}}{4}$

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