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+\input{preamble-standalone.ltx}
+\begin{document}
+
+% Ex. No. 21 (Section 7.5 : Quelques tangentes )
+
+\begin{tikzpicture}[scale=2]
+ \tkzInit[xmin=-5,xmax=2,ymin=-1, ymax=3]
+ \tkzDrawX
+ \tkzDrawY
+ \tkzText[draw,color = red,fill = orange!20]( 1.5,1.5){$y = xe^x$}
+ \tkzFct[color = red, domain = -5:1]{x*exp(x)}%
+ \tkzDrawTangentLine[color=blue,kr=2,kl=2](-2)
+ \tkzDrawTangentLine[color=green,kr=2,kl=2](-1)
+ \tkzDrawTangentLine[color=blue](0)
+ \tkzDrawTangentLine[color=blue,kr=0](1)
+\end{tikzpicture}
+
+\end{document}