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

% Ex. No. 13 (Section  5.3 : Options \tkzname{draw} et \tkzname{ref})

\begin{tikzpicture}[scale=1.25]
  \tkzInit[xmin=-2,xmax=2,xstep=1,
           ymin=-8,ymax=24,ystep=8]
  \tkzGrid
  \tkzAxeXY
  \tkzFct[domain =-1.5:1]{3.0-1.3125*x**5-2.5*x**3}
  \tkzDefPointByFct[draw,ref=A](.5)
  \tkzLabelPoint[above right](A){$a$}
\end{tikzpicture}

\end{document}