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\input{preamble-standalone.ltx}
\begin{document}
% Ex. No. 7 (Section 4.5 : \tkzname{ystep} et les fonctions constantes)
\begin{tikzpicture}[scale=0.4]
\tkzInit[xmax=30,ymax=90,ystep=6]
\tkzFct[line width=1pt,color=red,dashed,domain=0:30]{80.0}
\tkzFct[line width=1pt,color=blue,domain=0:30]{80/(1.0+4.0*exp(-0.21*x))}
\tkzText[above,color=red](20,80){$P=80$}
\end{tikzpicture}
\end{document}
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