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$\begin{aligned}\large 1+\frac{1}{4}+\frac{1}{9}+\frac{1}{16}+\ldots &=& \large \frac{π^2}{6} \\ \large 1+\frac{1}{9}+\frac{1}{25}+\frac{1}{49}+\ldots &=& \large \ ? \end{aligned}$

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