Pie, anyone?
Calculus
Level
2
\[\begin{eqnarray}\large 1+\frac{1}{4}+\frac{1}{9}+\frac{1}{16}+\ldots &=& \large \frac{π^2}{6} \\
\large 1+\frac{1}{9}+\frac{1}{25}+\frac{1}{49}+\ldots &=& \large \ ? \end{eqnarray} \]
by
Isam Dimacutac