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.
ab=1/sqrt(2); cd=1/sqrt(2); a^2+c^2=1;b^2+d^2=1
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random