Trigonometry! #46

Geometry Level 3

Simplify \[16 \cos \left (\frac {2\pi}{15} \right) \cos \left (\frac {4\pi}{15} \right) \cos \left (\frac {8\pi}{15} \right) \cos \left (\frac {16\pi}{15} \right)\]

This problem is part of the set Trigonometry.

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