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.
y'' = -9.8*sin(y) - 0.5*y', y(0)=0.8, y'(0)=0.8
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random