$\cos^3 110^{\circ} + \cos^3 10^{\circ} + \cos^3 130^{\circ} = $

  • A
    $\frac{3}{4}$
  • B
    $\frac{3}{8}$
  • C
    $\frac{3\sqrt{3}}{8}$
  • D
    $\frac{3\sqrt{3}}{4}$

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