integrate%5B((R%2FL)*x*(1-Pi%2F2) %2B Pi*R%2F2) * (R%2FL)*x%2C%7Bx%2C0%2CL%7D%5D

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.