$\cos ^3 \theta + \cos ^3(120^{\circ} + \theta) + \cos ^3(\theta - 120^{\circ}) = $

  • A
    $\frac{\sqrt{3}}{2} \cos \theta$
  • B
    $\frac{3}{4} \sec ^3 \theta$
  • C
    $\frac{3}{2} \tan ^3 \theta$
  • D
    $\frac{3}{4} \cos 3 \theta$

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