My current object with this problem is just to get to the integral. Once I have that I can solve for volume myself.

The Question is:

Here's a graph of the function as well:Quote:

The volume of the solid obtained by rotating the region enclosed by

about the y-axis can be computed using the method of disks or washers via an integral

with limits of integration and

The volume is

http://www4d.wolframalpha.com/Calcul...44&w=367&h=301

My Attempt:

Quote:

I use the flowing formula:

This is what I think the integral should be, but it's not.