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\input{preamble-standalone.ltx}
\begin{document}
% Ex. No. 15 (Section 5.5 : Placer des points sans se soucier des coordonnées)
\begin{tikzpicture}[scale=1.6]
\tkzInit[xmin = 0, xmax = 800,
ymin = 0, ymax = 2000,
xstep = 100,ystep = 400]
\tkzGrid
\tkzAxeXY
\tkzFct[color = blue,
domain = 0:800]%
{(1./90000)*\x*\x*\x-(1./100)*\x*\x+(113./36)*\x}
\foreach \va in {0,450,800}{%
\tkzDefPointByFct[draw](\va)}
\end{tikzpicture}
\end{document}
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