$\cos ^2(x)+\cos ^2\left(x+\frac{\pi}{3}\right)+\cos ^2\left(x-\frac{\pi}{3}\right) = $

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

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