I have 11 problems to do--all relating to finding the domains of polar equations--a concept that I don't understand.

Here are the graphs of the equations whose domains I need to find. The dashed lines indicate where the graph is undefined. If you can do them all, awesome, but at least 3 or 4 examples should suffice. I've bolded the ones I think are the most important in case no one has time or doesn't want to do them all:

1. http://i265.photobucket.com/albums/i...olargraph3.jpg (General equation: r = 2cos2θ)

2.http://i265.photobucket.com/albums/i...olargraph4.jpg (General equation: r = 3sin2θ)

3. http://i265.photobucket.com/albums/i...olargraph5.jpg (General equation: r = 2cosθ)

4. http://i265.photobucket.com/albums/i...olargraph6.jpg (General equation: r = -2sinθ)

5. http://i265.photobucket.com/albums/i...olargraph7.jpg (General equation: r = -sin3θ)

6. http://i265.photobucket.com/albums/i...olargraph8.jpg (General equation: r = -sin3θ)

7. http://i265.photobucket.com/albums/i...olargraph9.jpg (General equation: r = -sin3θ)

8. http://i265.photobucket.com/albums/i...largraph10.jpg (General equation: r = -sin3θ yet again)

9. http://i265.photobucket.com/albums/i...largraph11.jpg (General equation: r = 3cos4θ--this one was deemed "super difficult" by my teacher)