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.
(((i+1)-(2+i))((1)-(i)))/(((i+1)-(i))((1)-(2+i)))
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random