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.
tanh(x)/x^3-1/(x^2 Cosh(x)^2)-(sinh(2x)-2x)/(x^2 cosh(x)^2)
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random