$16 \sin 12^{\circ} \cos 18^{\circ} \sin 48^{\circ} = $

  • A
    $\sqrt{10-2 \sqrt{5}}$
  • B
    $\sqrt{10+2 \sqrt{5}}$
  • C
    $\sqrt{5}-1$
  • D
    $\sqrt{5}+1$

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