\begin{exercice}[Fonctions usuelles?]
Indiquer, si possible, le nom de la courbe et le nom de la famille de fonctions représentée.

\begin{tikzpicture}[scale=0.42,general]
           \draw [quadrillage] (-5,-5) grid (5,2);
           \draw (-3.5, 1) node[draw, circle, color=C1] {$a$};
            \axeX{-5}{5}{1}
            \axeY{-5}{2}{1}
            \origine
           \draw[smooth,domain=-2.236:2.236, color=A1, epais] plot(\x,{--(-(\x*\x))});
           \draw[color=A1] (2,-2) node {$\mathcal{C}_f$};
          \end{tikzpicture}
\hfill
\begin{tikzpicture}[scale=0.42,general]
           \draw [quadrillage] (-5,-3) grid (5,4);
          \draw (-3.5, 3) node[draw, circle, color=C1] {$b$};
            \axeX{-5}{5}{1}
            \axeY{-3}{4}{1}
            \origine
           \draw[smooth,domain=-3.103:3.419, color=A1, epais] plot(\x,{--(0.1*\x*\x*\x)});
           \draw[color=A1] (3,1) node {$\mathcal{C}_g$};
           \end{tikzpicture}

\begin{tikzpicture}[scale=0.42,general]
           \draw [quadrillage] (-5,-2) grid (5,5);
           \draw (-3.5, 4) node[draw, circle, color=C1] {$c$};
            \axeX{-5}{5}{1}
            \axeY{-2}{5}{1}
            \origine
           \draw[color=A1, epais] (-5,3)--(5,-2);
           \draw[color=A1] (1,2) node {$\mathcal{C}_f$};
           \end{tikzpicture} 
\hfill
\begin{tikzpicture}[scale=0.42,general]
           \draw [quadrillage] (-5,-2) grid (5,5);
            \draw (-3.5, 4) node[draw, circle, color=C1] {$d$};
            \axeX{-5}{5}{1}
            \axeY{-2}{5}{1}
            \origine
           \draw[smooth,domain=0.2:5, color=A1, epais] plot(\x,{--(1/\x)});
           \draw[smooth,domain=-5:-0.5, color=A1, epais] plot(\x,{--(1/\x)});
           \draw[color=A1] (0.75,4) node {$\mathcal{C}_f$};
           \end{tikzpicture}
\end{exercice}
