100 setxunit 7.5 setborder 90 setangle_repere -1.5 1.5 setxrange -1 1 setyrange 1 1 settkstep .5 .5 setsubtkstep 0.5 0.5 setmkstep ticks subticks marks traceaxes axesarrow /R {settvar #rpn# (Cos(t))^2 } def 0 10 pi mul settrange gsave .75 setlinewidth continu bleu (R) courbepolar grestore