2 Write down the equation of the locus represented by the circle in the Argand diagram shown in Fig. 2.
\begin{figure}[h]
\includegraphics[alt={},max width=\textwidth]{d7e20cfb-da04-4d7b-bcda-53f99f6faec4-2_581_600_872_737}
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\caption{Fig. 2}
\end{figure}