sum_(k=1)^(6)(sin^(2 pi k)(pi)/(7)-i cos^(2 pi k)(pi)/(7))

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sum_ (k = 1) ^ (6) (sin, (2 pi k) / (7) -i cos, (2 pi k) / (7)) =?

prod_ (k = 1) ^ (6) (sin ((2k pi) / (7)) - i cos ((2k pi) / (7))) =

The value of is sum_(k=1)^(10)(sin"" (2k pi)/(11)+ icos ""(2k pi)/(11)) is