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.
21+0.7071c-0.5547b=0 and -12-0.8320b-0.7071c=0
21+0.7071c-0.5547b=0 and -12-0.8320b-0.7071c=0
Natural Language
Math Input
Extended Keyboard