$\cos \frac{\pi }{7}\cos \frac{{2\pi }}{7}\cos \frac{{4\pi }}{7} = $
$\cos \frac{\pi }{7}\cos \frac{{2\pi }}{7}\cos \frac{{4\pi }}{7} = $
- A
$0$
- B
$\frac{1}{2}$
- C
$\frac{1}{4}$
- D
$ - \frac{1}{8}$
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