${\left( \frac{-1 + i\sqrt{3}}{2} \right)^{20}} + {\left( \frac{-1 - i\sqrt{3}}{2} \right)^{20}} = $

  • A
    $20\sqrt{3}i$
  • B
    $1$
  • C
    $\frac{1}{2^{19}}$
  • D
    $-1$

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