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.
ReplaceAll[(X * (1 - ATAN(A * X) * 2/pi *B)), {X -> 0.15, A -> 2, B-> 1}]
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random
