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Question Number 123456 by mnjuly1970 last updated on 25/Nov/20

$$...advancedcalculus...$$$$prove::$$$$\varphi =\underset{n=1}{\sum ^{\mathrm{\infty }}}\left(\frac{{\mathrm{H}}_n}{n^3}\right)\stackrel{???}{=}\frac{{\pi }^4}{72}$$$$note:{\mathrm{H}}_n=1+\frac{1}{2}+...+\frac{1}{n}$$

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