Mathematics Trigonometry Trigonometric Functions

The value of \(\rm \cos \frac{\pi}{5}\ cos \ \frac{2\pi}{5} \ cos \ \frac{4\pi}{5} \ cos \ \frac{8\pi}{5}\) is

1
\(\frac{1}{16}\)
2
0
3
\(\frac{-1}{8}\)
4
\(\frac{-1}{16}\)

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