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\input{preamble-standalone.ltx}
\begin{document}
% Ex. No. 67 (Section 14.7.2 : Première courbe avec $ b=1$)
\begin{tikzpicture}[xscale=2,yscale=2.5]
\tkzInit[xmin=0,xmax=6,ymax=0.5,ystep=0.1]
\tkzDrawX[label=$v$]
\tkzDrawY[label=$g(v)$]
\tkzGrid(0,0)(6,0.5)
\tkzFct[color = red,domain =1:6]{(2*(x-1)*(x-1))/(x*x*x)}
\tkzDrawTangentLine[color=blue,draw](3)
\tkzDefPointByFct(1)
\tkzText[draw, fill = brown!30](4,0.1){$g(v)=2\dfrac{(v-1)^2}{v^3}$}
\end{tikzpicture}
\end{document}
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