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.
alternate form 0.5 *tanh(-0.5*x) + 0.5
alternate form 0.5 *tanh(-0.5*x) + 0.5
Natural Language
Math Input
Extended Keyboard
