1 setxyrapport
40 setxunit
7.5 setborder
90 setangle_repere
-4 1 setxrange
-1 1 setyrange
1 1 settkstep
0.5 0.5 setsubtkstep
2 2 setmkstep
ticks
subticks
marks
traceaxes
axesarrow
0.75 setlinewidth
continu
bleu
/X {settvar
#rpn#   2*(cos(t))^2+ln(((sin(t))^2)^(1/2))
} def
/Y {settvar
#rpn#   sin(2*t)
} def
  100 neg  100 {X} {Y} Courbeparam