25 setxunit
7.5 setborder
90 setangle_repere
-5 5 setxrange
-5 5 setyrange
1 1 settkstep
.5 .5 setsubtkstep
2 2 setmkstep
ticks
subticks
marks
traceaxes
axesarrow
.75 setlinewidth
continu
bleu
/X {settvar
#rpn# (t^2 - 4) / (t + 1)
} def
/Y {settvar
#rpn# (1 - 4 * t^2) / (t * (t + 1))
} def
pi neg pi {X} {Y} Courbeparam
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