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+\input{preamble-standalone.ltx}
+\begin{document}
+
+% Ex. No. 25 (Section 7.9.1 : Utilisation de \tkzcname{tkzFctLast})
+
+\begin{tikzpicture}[scale=2]
+ \tikzstyle{tan style}=[-]
+ \tkzInit[xmin=-5,xmax=2,ymin=-1,ymax=3]
+ \tkzDrawXY
+ \tkzText[draw,color = red, fill = orange!20](1.5,1.5){$y = xe^x$}
+ \global\edef\tkzFctLast{x*exp(x)}% c'est la ligne importante
+ \foreach \v in {-4,-3.8,...,0}{%
+ \tkzDrawTangentLine[color=blue,line width=.4pt,kl=1](\v)}
+ \foreach \v in {0.6,0.8,1}{%
+ \tkzDrawTangentLine[color=blue,line width=.4pt,kr=0,kl=.75](\v)}
+\end{tikzpicture}
+
+\end{document}