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.
lim n->inf ((-1)^(4n+1)n^2+13sin(3n^2+2))/(3n^2+(-1)^n*n+3arctg(1+n))
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random