QuestionGraph $r=2 \cos \theta$ by filling out the following table and plotting the points. Then connect the points using a smooth curve to get the graph. \begin{tabular}{|l|l|} \hline$\theta$ & \\ \hline 0 & $2 \cos 6=0,(0,0)$ \\ \hline$\frac{\pi}{6}$ & 2006 \\ \hline$\frac{\pi}{4}$ & \\ \hline$\frac{\pi}{3}$ & \\ \hline$\frac{\pi}{2}$ & \\ \hline$\frac{2 \pi}{3}$ & \\ \hline$\frac{3 \pi}{4}$ & \\ \hline$\frac{5 \pi}{6}$ & \\ \hline$\pi$ \\ \hline \end{tabular}