\documentclass{article} \usepackage[latin1]{inputenc} \usepackage[T1]{fontenc} \usepackage{lmodern} \usepackage{amsmath} \usepackage{tkz-tab} \parindent=0pt \begin{document} \begin{tikzpicture} \tikzset{double style/.style = {double,double distance=1pt}} \tkzTabInit[lgt=2,espcl=1] {$x$ /1, $x^2-3x+2$ /1, $\ln (x^2-1)$ /1, $E(x)$ /1}% {$-\infty$ ,$-\sqrt{2}$, $-1$ , $1$ ,$\sqrt{2}$ , $2$ , $+\infty$}% \tkzTabLine{ , + , t , + , t , + , z , - , t , - , z , + , } \tkzTabLine{ , + , z , - , d , h , d , - , z , + , t , + , } \tkzTabLine{ , + , z , - , d , h , d , + ,z , - , z , + , } \end{tikzpicture} \end{document} % latin1 % pdflatex % Alain Matthes