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.
solve 19.915470*x*(1-0.9)+0.9*atan(19.915470*x)=tan(pi/(2*1.506367))
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random