%
% tkz-euclide (14/01/2011)
%
% Coding (utf8) Creator (TeX) Producer (pdfeTeX) 
% Author Alain Matthes
\input{tkzfctpreamble.ltx}

\begin{document}

\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} 
