setxunit
7.5 setborder
90 setangle_repere
-3 3 setxrange
-3 3 setyrange
/quadrillagegray 0.4 def
1 setquadrillagexstep
1 setquadrillageystep
quadrillage
1 1 settkstep
.5 .5 setsubtkstep
2 2 setmkstep
ticks
subticks
marks
traceaxes
axesarrow
unites
/f {setxvar
#rpn# x^3 +3x
} def
gsave
bleu
.75 setlinewidth
pointilles
{f} courbe
grestore
2.8 settailletangente
-2 {f} tangente
-1 {f} tangente
0 {f} tangente
2 {f} tangente
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