\begin{array}{l}{\cos \frac{\pi}{7}+\cos \frac{2 \pi}{7}+\cos \frac{3 – InterviewSolution

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1.	\begin{array}{l}{\cos \frac{\pi}{7}+\cos \frac{2 \pi}{7}+\cos \frac{3 \pi}{7}+\cos \frac{4 \pi}{7}+\cos \frac{5 \pi}{7}+\cos \frac{6 \pi}{7}=} \\ {\text { 1) } 0}\end{array}
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