A trick problem !!

Geometry Level 2

Given that, cosπ28cos2π28cos3π28....cos28π28=a\large \cos \frac{\pi}{28} \cos \frac{2 \pi}{28} \cos \frac{3 \pi}{28} .... \cos \frac{28 \pi}{28}=a.

Find the value of aa.

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