analyis

[elo]

prove using definition of convergence that lim(-1)^n/n^2=0

 

[HallsofIvy]

It's hard to help if we don't know what you have tried and where you have a problem. Do you know what the "definition of convergence" is? What do you get when you put the information from this problem into that definition? While the definition of convergence is a part of analysis, once you have that the rest is pretty much simple algebra.