25 setxunit
7.5 setborder
90 setangle_repere
-4 4 setxrange
-4 4 setyrange
1 1 settkstep
.5 .5 setsubtkstep
2 2 setmkstep
ticks
subticks
marks
traceaxes
axesarrow
unites
/f {setxvar
#rpn# x^2-x-2
} def
gsave
bleu
1,5 setlinewidth
continu
{f} courbe
grestore
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