So the title pretty much says it all, what other infinite series summations do we have for Pi^2/6 besides,(adsbygoogle = window.adsbygoogle || []).push({});

$$\sum_{n=1}^{\infty} 1/n^2$$

***EDIT*** I should also include,

$$\sum_{n=1}^{\infty} 2(-1)^(n+1)/n^2$$

$$\sum_{n=1}^{\infty} 4/(2n)^2$$

etc. etc.

A unique form outside of the 1/n^2 family.

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# What is another infinite series summation for Pi^2/6 besides 1/n^2?

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