Présentation de 2491.jps

/syracuse/bbgraf/tmp/2491.jpg
25 setxunit 7.5 setborder 90 setangle_repere -7 5 setxrange -6 6 setyrange 1 1 settkstep .5 .5 setsubtkstep 2 2 setmkstep ticks subticks marks traceaxes axesarrow /R {settvar #rpn# 1/(Cos(t/3)^3) } def 0 3 pi mul settrange gsave .75 setlinewidth continu bleu (R) courbepolar grestore