Find the point(s) of intersection of the curves $r = 1$ and $r = 2cos\theta$,
\begin{itemize}
\item a) $[1, \frac{\pi}{6}]$
\item b) $[1, \frac{\pi}{3}]$
\item c) $[1, \frac{\pi}{3}], [1, -\frac{\pi}{3}]$
\item d) $[1, \frac{\pi}{6}], [1, -\frac{\pi}{6}]$
\item e) $[1, \frac{\pi}{4}], [1, -\frac{\pi}{4}]$
\end{itemize}
