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sum(k=1)^6 (sin,(2pik)/7 -icos, (2pik)/...

`sum_(k=1)^6` `(sin,(2pik)/7 -icos, (2pik)/7)=?`

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  3. sum(k=1)^6 (sin,(2pik)/7 -icos, (2pik)/7)=?

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