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[ D[ 1/(sqrt(2*pi)) * e^(-x^2/(2*1^2)), {x,2}], {x,-infinity,infinity}] / (sqrt(2*pi))
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random