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.
d/dt ReplaceAll[u^2+v^2,{u->e^t,v->t^2}]
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random