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Mentallic

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## Main Question or Discussion Point

[tex]\sum_{n=1}^{\infty}n^{-2}=\frac{\pi^2}{6}[/tex]

I'd like to know how to prove this summation. And if possible, what is the significance of having [itex]\pi[/itex] in the answer?

I'd like to know how to prove this summation. And if possible, what is the significance of having [itex]\pi[/itex] in the answer?