40 setxunit 7.5 setborder 90 setangle_repere -5 5 setxrange -4 7 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^2 } def /g {setxvar #rpn# 1/x } def /h {setxvar #rpn# 1/x^2 } def gsave bleu .75 setlinewidth continu {f} courbe grestore gsave rouge .75 setlinewidth continu xmin .01 neg {g} Courbe .01 xmax {g} Courbe grestore gsave vert .75 setlinewidth continu {h} courbe grestore rouge $y={1\over x}$ -4 -3 [1.5 1.5] urtexlabel bleu $y=x^2$ 3 6 [1.5 1.5] drtexlabel vert $y={1\over x^2}$ -4 2 [1.5 1.5] drtexlabel