7 lblPreambule := "\usepackage[frenchb]{babel}" &
8 "\usepackage[garamond]{mathdesign}" &
9 "\usepackage{amsmath}";
17 vardef f(expr t) = t/sqrt(1+t*t) enddef;
18 vardef g(expr t) = t*(1+f(t)) enddef;
19 vardef h(expr t) = -t*(1+f(t)) enddef;
21 def avecCrayon(expr t,c) = withpen pencircle scaled t withcolor c enddef;
31 Graduations; Unites(1);
33 trace Droite((1,-2),(1,2)) withcolor MidnightBlue;
35 trace (-1,0)..Courbe(f,g,-18,18,200) avecCrayon(1.5,DarkSalmon);
36 trace (-1,0)..Courbe(f,h,-18,18,200) avecCrayon(1.5,DarkSalmon);