Trigo Treat

Geometry Level 4

\[\cos \left(\frac{2\pi}{28}\right)\cdot \csc \left(\frac{3\pi}{28}\right)+\cos \left(\frac{6\pi}{28}\right)\cdot \csc \left(\frac{9\pi}{28}\right) \\ +\cos \left(\frac{18\pi}{28}\right)\cdot \csc \left(\frac{27\pi}{28}\right) = \, ? \]

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