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k-k-2-k-1-k-4-1-




Question Number 214997 by MrGaster last updated on 25/Dec/24
                     Σ_(k=−∞) ^(+∞) ((k^2 +k+1)/(k^4 +1))=?
$$ \\ $$$$\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\underset{{k}=−\infty} {\overset{+\infty} {\sum}}\frac{{k}^{\mathrm{2}} +{k}+\mathrm{1}}{{k}^{\mathrm{4}} +\mathrm{1}}=? \\ $$$$ \\ $$

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