Question Number 134619 by payamnazerian last updated on 05/Mar/21
![Σ_(n=1) ^∞ (((−1)^(n−1) H_n )/n^2 )=???](https://www.tinkutara.com/question/Q134619.png)
$$\:\:\:\: \\ $$$$\:\:\:\:\:\underset{{n}=\mathrm{1}} {\overset{\infty} {\sum}}\frac{\left(−\mathrm{1}\right)^{\boldsymbol{{n}}−\mathrm{1}} \boldsymbol{{H}}_{{n}} }{\boldsymbol{{n}}^{\mathrm{2}} }=??? \\ $$