\documentclass[12pt]{article} \usepackage[latin1]{inputenc} \usepackage[frenchb]{babel} \usepackage{amsmath} \usepackage{xcolor,graphicx} \usepackage[charter]{mathdesign} \renewcommand{\ttdefault}{lmtt} \usepackage[margin=2cm]{geometry} \pagestyle{empty} \parindent0pt \newcommand{\MarqueCommandeGiac}[1]{% \color[HTML]{8B7500}$\rightarrow$} \newcommand{\MarqueLaTeXGiac}{% \color[HTML]{1E90FF}} \newcommand{\InscriptionFigureGiac}[1]{% \begin{center} \includegraphics{#1} \end{center}} \begin{document} %@Commande-1 {\MarqueCommandeGiac{1} \verb| read("XcasTabSign.meta"):;|} %@Commande-2 {\MarqueCommandeGiac{2} \verb| read("XcasTabSignL.meta"):;|} %@Commande-3 {\MarqueCommandeGiac{3} \verb| read("XcasTabSignQ.meta"):;|} %@Commande-4 {\MarqueCommandeGiac{4} \verb| read("XcasTV.meta"):;|} Pour étudier le signe de $(-2x+3)(-x+5)$, on entre: %@Commande-4 {\MarqueCommandeGiac{4} \verb|TSa(-2,3,-1,5,1);|} \InscriptionFigureGiac{test03-01.pdf} Étude du signe de \[(-2x+3)(x^2-1)(x^2+1)(x-1)(x^2-2)\] On entre les expressions sous cette forme: %@Commande-5 {\MarqueCommandeGiac{5} \verb| TS([-2*x+3,x^2-1,x^2+1,x-1,x^2-2],1);|} \InscriptionFigureGiac{test03-02.pdf} Étude du signe de $\dfrac{(-2x+3)(-4x+5)}{(x^2-16)(x-2)}$~: %@Commande-6 {\MarqueCommandeGiac{6} \verb|TSq("Q",[-2*x+3,-4*x+5],[x^2-16,x-2],1);|} \InscriptionFigureGiac{test03-03.pdf} Voici le tableau de variation de $g~:~t\mapsto \frac{t^2}{t^2-1}$ sur $[-10,+\infty[$~: %@Commande-7 {\MarqueCommandeGiac{7} \verb|TV([-10,+infinity],[-1,1],"g","t",x^2/(x^2-1),1,1);|} \InscriptionFigureGiac{test03-04.pdf} \end{document}