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\input{preamble-standalone.ltx}
\begin{document}
% Ex. No. 18 (Section 7.2 : Tangente avec \tkzname{xstep} et \tkzname{ystep} différents de 1)
\begin{tikzpicture}[xscale=1.5]
\tikzset{tan style/.style={-}}
\tkzInit[xmin=0,xmax=800,xstep=100,
ymin=0,ymax=1800,ystep=400]
\tkzGrid[color=brown,sub,subxstep=50,subystep=200](0,0)(800,1800)
\tkzAxeXY
\tkzFct[color=red,samples=100,domain = 0:800]%
{(1./90000)*\x*\x*\x-(1./100)*\x*\x+(113./36)*\x}
\tkzDrawTangentLine[color=blue,kr=300,kl=450,coord](450)
\tkzText[draw, color = black,%
fill = brown!50, opacity = 0.8](300,1200)%
{$f(x)=\dfrac{1}{90000}x^3 -\dfrac{1}{{100}}x^2 +\dfrac{113}{36}x$}
\end{tikzpicture}
\end{document}
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