+input gdd;
+input gdd-rep;
+input gdd-lbl;
+input gdd-tra;
+input svgnames;
+
+lblPreambule := "\usepackage[frenchb]{babel}" &
+ "\usepackage[garamond]{mathdesign}" &
+ "\usepackage{amsmath}";
+
+input gdd-fct;
+input gdd-plt;
+
+labeloffset := 6;
+gddU:=1.5cm;
+
+vardef r(expr t) = 4*cos(t/3)*cos(t/3)*cos(t/3) enddef;
+
+vardef rp(expr t) = (r(t)*cos(t),r(t)*sin(t)) enddef;
+
+def traceDoubleVecteur(expr o,d)= drawdblarrow ((o-d)--(o+d)) gddEnPlace enddef;
+
+def avecCrayon(expr t,c) = withpen pencircle scaled t withcolor c enddef;
+
+
+a = arccos(1/sqrt(3));
+
+
+
+beginfig(1);
+
+
+ Repere(8,8,2,4,1,1);
+ Axes;
+ Debut;
+ Graduations; Unites(1);
+
+ drawoptions(withcolor Gainsboro);
+
+
+ trace CourbeEnPolaires(r,0,3Pi,450)
+ avecCrayon(1.5,Crimson);
+
+ drawoptions(withcolor LightGoldenrod);
+
+ pointe Point(0,0);
+
+ Fin;
+
+
+endfig;
+
+end
\ No newline at end of file