$\sin ^3 10^{\circ}+\sin ^3 50^{\circ}-\sin ^3 70^{\circ}=$

  • A
    $\frac{-3}{8}$
  • B
    $\frac{3}{4}$
  • C
    $\frac{\sqrt{3}}{2}$
  • D
    $\frac{-1}{3}$

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