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.
plot e^x+e^(-x)+e^y+e^(-y)=e+1/e+2, x^2+y^2=1
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random