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\sum\limits_{i=1}^{n} ((1+2i/n)^3-(1+2i/n)^2+2(1+2i/n)-1)*2/n
\sum\limits_{i=1}^{n} ((1+2i/n)^3-(1+2i/n)^2+2(1+2i/n)-1)*2/n
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