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_{i=1}^n ((1+i*2/n)^3-(1+i*2/n)^2+2(1+i*2/n)-1)*2/n
\sum_{i=1}^n ((1+i*2/n)^3-(1+i*2/n)^2+2(1+i*2/n)-1)*2/n
Natural Language
Math Input
Extended Keyboard
