I can do the integral for these problems all day long but cannot determine the boundaries to save my life. Polar coordinates are my arch nemesis at the moment.

The problem:

find the area bounded by =$\displaystyle r=3sin(3\theta)$

1. $\displaystyle 1/2\int_a^b(3sin(3\theta))^2d\theta$

2. find boundaries

3. do integral

4. win

I must have been catatonic when boundaries were explained because I simply do not get how to find them.

thanks for any help!