કિંમત શોધો: $\cos \frac{\pi}{5} \cos \frac{2\pi}{5} \cos \frac{4\pi}{5} \cos \frac{8\pi}{5}$

  • A
    $1/16$
  • B
    $0$
  • C
    $-1/8$
  • D
    $-1/16$

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