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n-1-coth-n-n-3-




Question Number 127293 by Dwaipayan Shikari last updated on 28/Dec/20
Σ_(n=1) ^∞ ((coth(n))/n^3 )
$$\underset{{n}=\mathrm{1}} {\overset{\infty} {\sum}}\frac{{coth}\left({n}\right)}{{n}^{\mathrm{3}} } \\ $$

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