CwhBER
Written on June 24, 2019
% Dans le préambule
% -----------------
\usepackage{pstricks-add}
% -----------------
\psset{xunit=1cm,yunit=0.5cm}
\begin{pspicture}(-1.5,-1)(3.5,4.5)
\psaxes(0,0)(-1.5,-0.5)(3.5,4.5)
\psplot[algebraic]{-1.1}{3.1}{ (1+x)*(3-x) }
% Place le point A et les pointilles
\psdots(2,3) \uput[45](2,3){$A$}
\psline[linestyle=dotted](2,0)(2,3)(0,3)
\end{pspicture}