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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}
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