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sum(k=1)^10(sin(2kpi)/11+icos(2kpi)/11)...

`sum_(k=1)^10(sin(2kpi)/11+icos(2kpi)/11)`

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The value of sum_(n=1)^(10) {sin(2npi)/11-icos(2npi)/11} , is

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