Chapter 7.4, Problem 9CVC

Fill in each blank so that the resulting statement is true.

The graphs of $r^2=a^2\sin 2\theta$ and $r=a^2\cos 2\theta ,a\ne 0$, are shaped like propellers and called ____________. The graph of $r^2=a^2\sin 2\theta$ is symmetric with respect to the _________. The graph of $r^2=a^2\cos 2\theta$ is symmetric with respect to the ___________, the __________, and __________.