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[ Sin[2 k^2 Pi / 100], {k,1,100}] - Sqrt[100]/2 (1+Cos[100 Pi/2] - Sin[100 pi / 2])
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random