30 setxunit
60 setyunit
-12 12 setxrange
-1 1 setyrange

[1 1 .5 .5 .1 .1] {orange} Quadrillage
/unites {} def
tracerepere
2 1 setmkstep
marks

/dx_boxit 3 def
/dy_boxit 3 def
/linearc .05 def
/fillstyle {jaune fill} def
boxit
<tex>
$\displaystyle {
   y = \int _0^x \sin \left( {\pi t^2\over 2} \right) \, dt
}$
</tex>
-6 .5 [1.2 dup] cctexlabel

1000 setresolution
bleu
{fresnelS} courbe