Présentation de 2615.jps

25 setxunit
7.5 setborder
90 setangle_repere
-40 5 setxrange
-40 40 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 6 pi mul  settrange
gsave
   .75 setlinewidth
   continu
   bleu
   (R) courbepolar
grestore