Trigonometry! #56

Geometry Level 3

Find the value of \[\left (1+ \cos \frac {\pi}{8}\right)\left (1+ \cos \frac {3\pi}{8}\right)\left (1+ \cos \frac {5\pi}{8}\right)\left (1+ \cos \frac {7\pi}{8}\right)\]

This problem is part of the set Trigonometry.

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