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[" For any integer "k," let "alpha_(k)=cos((k pi)/(7))+i sin((k pi)/(7))," where "i=sqrt(-1)" .The value of the expression "],[(sum_(k=1)^(12)| alpha_(k+1)-alpha_(k)|)/(sum^(3)| alpha_(4k-1)-alpha_(4k-2)|)" is "]

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