The value of \( \cos \frac{2 \pi}{7}+\cos \frac{4 \pi}{7}+\cos \frac{6 \pi}{7} \), is (A) 1 (B) ...
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0The value of \( \cos \frac{2 \pi}{7}+\cos \frac{4 \pi}{7}+\cos \frac{6 \pi}{7} \), is
(A) 1
(B) \( -1 \)
(C) \( 1 / 2 \)
(D) \( -1 / 2 \)
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