1729 warriors united...where is the army !!!

Geometry Level 4

Find the value of the sum cosA+cos(A+2π1729)+cos(A+4π1729)+....to 1729 termscosA+cos\left( A+\frac{2\pi}{1729} \right) +cos\left( A+\frac{4\pi}{1729} \right) +.... to \ 1729 \ terms


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