**Answer**

I would try and optimize the sum at the bottom a bit. Definitely we need parentheses around the −1, but just throwing them in will cause a bit of a mess:

π2/12=∞∑n=1((−1)n+1(1/n2))

Plus, math that’s not typeset well already gives me a less-than-stellar vibe; I’m not a huge fan of the font there.

Instead, you could rewrite the sum a bit, if you have the space for it. The version below takes up only slightly more vertical space than the Sigma, if vertical space is a concern. It’s a bit less cluttered, and LaTeX’s job (technically Mathjax here) is to make sure the typesetting is as good as possible.

π212=∞∑n=1(−1)n+1n2

**Attribution***Source : Link , Question Author : HopDavid , Answer Author : pjs36*