200 setxunit 7.5 setborder 90 setangle_repere -1 1 setxrange -1 1 setyrange 1 1 settkstep .5 .5 setsubtkstep 2 2 setmkstep ticks subticks marks traceaxes axesarrow /X {settvar t Sin 2 t mul Cos mul } def /Y {settvar t Cos 3 t mul Sin mul } def gsave 1.75 setlinewidth continu bleu 0 1 pi mul {X} {Y} Courbeparam grestore