sum from n %3D 1 to m of sin(pi*n)*(n%5E2(n%5E2%2B2))%2F((n%5E2-4)(n%5E2-1))

Uh oh! Wolfram|Alpha doesn't run without JavaScript.

Please enable JavaScript. If you don't know how, you can find instructionshere.Once you've done that, refresh this page to start using Wolfram|Alpha.