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\input{preamble-standalone.ltx}
\begin{document}
% Ex. No. 68 (Section 14.7.3 : Deuxième courbe $b=1/3$ )
\begin{tikzpicture}[scale=1.2]
\tkzInit[xmin=0,xmax=2,xstep=0.2,ymax=1,ystep=0.1]
\tkzAxeXY
\tkzGrid(0,0)(2,1)
\tkzFct[color = red,domain =1/3:2]{(2*(\x-1./3)*(\x-1./3))/(\x*\x*\x)}
\tkzDrawTangentLine[draw,color=blue,kr=.5,kl=.5](1)
\tkzDefPointByFct(1)
\tkzText[draw,fill = brown!30](1.2,0.3)%
{$g(v)=2\dfrac{\left(v-\dfrac{1}{3}\right)^2}{v^3}$}
\end{tikzpicture}
\end{document}
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