\newpage
\textbf{Question 9}

REWRITE

\begin{figure}[h]
    \centering

    \begin{subfigure}{0.48\textwidth}
        \centering
        %%\includegraphics[width=\textwidth]{Illustrations/Q9Poles}
        \caption{Valeurs propres en temps continu.}
    \end{subfigure}
    \hfill
    \begin{subfigure}{0.48\textwidth}
        \centering
        %%\includegraphics[width=\textwidth]{Illustrations/Q9001}
        \caption{$T_s = 0{,}01\,\mathrm{s}$.}
    \end{subfigure}

    \vspace{0.3cm}

    \begin{subfigure}{0.48\textwidth}
        \centering
        %%\includegraphics[width=\textwidth]{Illustrations/Q9002_}
        \caption{$T_s = 0{,}02\,\mathrm{s}$.}
    \end{subfigure}
    \hfill
    \begin{subfigure}{0.48\textwidth}
        \centering
        %%\includegraphics[width=\textwidth]{Illustrations/Q9004_}
        \caption{$T_s = 0{,}04\,\mathrm{s}$.}
    \end{subfigure}

    \caption{Comparaison des valeurs propres du système en boucle fermée.}
\end{figure}