25 setxunit
7.5 setborder
90 setangle_repere
-20 20 setxrange
-20 20 setyrange
/quadrillagegray 0.4 def
1 setquadrillagexstep
1 setquadrillageystep
quadrillage
1 1 settkstep
.5 .5 setsubtkstep
2 2 setmkstep
ticks
subticks
marks
traceaxes
axesarrow
.75 setlinewidth
continu
bleu
/X {settvar
#rpn# 1/(1+t) + 1/t
} def
/Y {settvar
#rpn# 1/(t-1) + 1/t
} def
100 neg 100 {X} {Y} Courbeparam
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