\begin{exercice}
Même consigne qu'à l'exercice \RefExercice{1SF4_E_extrema_2}.
 \setlength{\columnseprule}{0pt}
 \begin{multicols}{3}
  \begin{tikzpicture}[general, scale=0.7]
   \axeX{-1.8}{1.8}{-1,1}
   \axeY{-1}{1}{-1,1}
   \origine
   \draw [domain=-1.8:1.8, color=A1, smooth] plot(\x,{-((\x)^4-2*(\x)^2)/4});
   \draw (1,0.5) [color=A1] node{{\boldmath $\mathcal{C}_{1}$}};
  \end{tikzpicture}
  
  \begin{tikzpicture}[general, scale=0.7]
   \axeX{-1.8}{1.8}{-1,1}
   \axeY{-1}{1}{-1,1}
   \origine
   \draw [domain=-1.19:1.19, color=A1, smooth] plot(\x,{(\x+1)*(\x-1)*\x*2});
   \draw (1,0.5) [color=A1] node{{\boldmath $\mathcal{C}_{2}$}};
  \end{tikzpicture}
  
  \begin{tikzpicture}[general, scale=0.7]
   \axeX{-1.8}{1.8}{-1,1}
   \axeY{-1}{1}{-1,1}
   \origine
   \draw [domain=-1.73:1.73, color=A1, smooth] plot(\x,{((\x)^4-2*(\x)^2)/4+1/4});
   \draw (1,0.5) [color=A1] node{{\boldmath $\mathcal{C}_{3}$}};
  \end{tikzpicture}
 \end{multicols}
 \setlength{\columnseprule}{1pt}
 
 \begin{center}
  \begin{tikzpicture}[general, scale=1]
   \axeX{-2}{2}{-1,1}
   \axeY{-1}{1}{-1,1}
   \origine
   \draw [domain=-1.33:1.33, color=J1, smooth] plot(\x,{(\x+1)*(\x-1)*\x});
   \draw (1.5,0.5) [color=J1] node{{\boldmath $\mathcal{C}_{f'}$}};
   \end{tikzpicture}
 \end{center}
\end{exercice}