Uh oh! Wolfram|Alpha doesn't run without JavaScript.
Please enable JavaScript. If you don't know how, you can find instructions
here
.
Once you've done that, refresh this page to start using Wolfram|Alpha.
sum of exp (2 pi n) / (exp (2 pi n) - 1)^2 for n=1..infinity
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random
