25 setxunit
7.5 setborder
90 setangle_repere
-3 7.5 setxrange
-0.5 2.5 setyrange
.5 .5 settkstep
.5 .5 setsubtkstep
2 2 setmkstep
ticks
subticks
marks
traceaxes
axesarrow
0.75 setlinewidth
continu
noir
/X {settvar
#rpn#   t-Sin(t)
} def
/Y {settvar
#rpn#   1-Cos(t)
} def
  3 pi mul neg  3 pi mul {X} {Y} Courbeparam