$\cos 12^{\circ} \cdot \cos 24^{\circ} \cdot \cos 36^{\circ} \cdot \cos 48^{\circ} \cdot \cos 72^{\circ} \cdot \cos 84^{\circ} = $

  • A
    $\frac{1}{32}$
  • B
    $\frac{1}{16}$
  • C
    $\frac{1}{64}$
  • D
    $\frac{1}{128}$

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