lim n->1 ((-1)^n*sqrt(n^2-n)-n)/((-1)^(n+1)*sqrt((n+1)^2-n-1)-n-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.