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\input{preamble-standalone.ltx}
\begin{document}

% Ex. No. 3 (Section  3.4 :  Test de l'installation de tkz-fct)

\begin{tikzpicture}[scale=1.25]
    \tkzInit[xmin=-5,xmax=5,ymax=2]
    \tkzGrid
    \tkzAxeXY
    \tkzFct[color=red]{2*x**2/(x**2+1)}
\end{tikzpicture}

\end{document}