$\cos \frac{\pi}{7} \cos \frac{2\pi}{7} \cos \frac{3\pi}{7} =$

  • A
    $-\frac{1}{8}$
  • B
    $\frac{1}{16}$
  • C
    $\frac{1}{8}$
  • D
    કોઈ નહીં

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