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For any integer k let alphak=cos((kpi)/7...

For any integer k let `alpha_k=cos((kpi)/7)+isin((kpi)/7)` where `i=sqrt(-1)` the value of expression `(sum_(k=1)^(12) abs(alpha_(k+1)-alpha_k))/(sum_(k=1)^3 abs((alpha_(4k-1)-alpha_(4k-2))`

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