% !TeX TXS-program:compile = txs:///pdflatex

\documentclass[margin=5mm]{standalone}
\usepackage[nonpgfplots]{tkz-grapheur}

\begin{document}

\begin{GraphiqueTikz}[x=1cm,y=1cm,Xmin=-0.8,Xmax=12.8,Xgrille=1,Xgrilles=1,Ymin=-0.8,Ymax=9,Ygrille=1,Ygrilles=1]
	\TracerAxesGrilles[Origine]{1}{1}
	%\DefinirCourbe[Nom=cf,Trace,Couleur=blue]< t >{0.52425*(x-8)+4.3775}
	%\DefinirCourbe[Nom=cf,Trace,Couleur=red,Debut=0.001,Pas=0.01]< f >{-1.366*ln(x)-0.048*x^(2)+1.463*x-1.414}
	\DefinirCourbe[Nom=cf,Trace,Couleur=blue]< t >{0.52*(x-8)+4.35}
	\DefinirCourbe[Nom=cf,Trace,Couleur=red,Debut=0.1,Pas=0.01]< f >{2.1272*ln(x)+0.2918*x-2.711+2.4191/x}
	\DefinirImage[Nom=IMGf]{f}{8}
	\MarquerPts{(IMGf)/$A$/above}
	\PlacerTexte[Couleur=red]{(12.5,6)}{$C_{f}$}
	\PlacerTexte[Couleur=blue]{(12.5,7)}{$T$}
\end{GraphiqueTikz}

\end{document}