integrate z(e^{-z}(1-e^{-2z})+2e^{-2z}(1-e^{-z})) on [0,\infty)

Uh oh! Wolfram|Alpha doesn't run without JavaScript.

Please enable JavaScript. If you don't know how, you can find instructionshere.Once you've done that, refresh this page to start using Wolfram|Alpha.