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\input{preamble-standalone.ltx}
\begin{document}
% Ex. No. 28 (Section 8.3 : Surface simple)
\begin{tikzpicture}[scale=1.75]
\tkzInit[xmin=0,xmax=800,xstep=100,
ymin=0,ymax=2000,ystep=400]
\tkzGrid
\tkzAxeXY
\tkzFct[domain = 0:800]{(1./90000)*\x*\x*\x-(1./100)*\x*\x+(113./36)*\x}
\tkzDefPoint(450,400){a}
\tkzDrawPoint(a)
\tkzDrawArea[color=orange!50, domain =0:450]
\tkzDrawArea[color=orange!80, domain =450:800]
\end{tikzpicture}
\end{document}
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