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[" 16.The value of "sum(k=1)^(6)(sin(2 p...

[" 16.The value of "sum_(k=1)^(6)(sin(2 pi k)/(7)-i cos(2 pi k)/(7))," is "],[[" (a) "-1," (b) "0," (c) "-i," (d) "i]]

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