\documentclass[12pt,a4paper]{article}
\usepackage[francais]{babel}
\usepackage{mafr}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{lmodern}
\usepackage[dvipsnames]{xcolor}
\usepackage{pstricks}
\usepackage{pst-eucl}
\begin{document}
\begin{footnotesize}
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\pstGeonode[PosAngle={180,-50,90}](1,4){A}(5,1){B}(4,5){C}%
\pspolygon(A)(B)(C)%
\pstBissectBAC[linestyle=dashed,linecolor=cyan]{B}{A}{C}{P1}%
\pstBissectBAC[linestyle=dashed,linecolor=cyan,PointName=none,%
			   PointSymbol=none,nodesep=-10]{C}{B}{A}{P2}%
\pstOutBissectBAC[linecolor=red,nodesep=-10]{A}{C}{B}{P3}%
\end{pspicture*}
\end{footnotesize}
\end{document}
