$\cos ^4 \frac{\pi}{12} + \cos ^4 \frac{5 \pi}{12} + \cos ^4 \frac{7 \pi}{12} + \cos ^4 \frac{11 \pi}{12} = $

  • A
    $2$
  • B
    $1$
  • C
    $\frac{7}{4}$
  • D
    $\frac{3}{2}$

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