$4 \cos^3 20^{\circ}$ का मान क्या है?

  • A
    $-\frac{1}{2} - \cos 20^{\circ}$
  • B
    $-\frac{1}{2} + 3 \cos 20^{\circ}$
  • C
    $\frac{1}{2} + 3 \cos 20^{\circ}$
  • D
    $\frac{1}{2} - 3 \cos 20^{\circ}$

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