Trigo Treat

Geometry Level 4

cos(2π28)csc(3π28)+cos(6π28)csc(9π28)+cos(18π28)csc(27π28)=?\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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