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[" For any integer "k," let "alpha(n)=co...

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

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