-6 6 setxrange
-2 2 setyrange

50 setxunit
[1 1 .5 .5 .1 .1] {orange} Quadrillage

/f {
   Arctan
} def

tracerepere
marks

<tex>
$$
   y = \arctan x
$$
</tex>

/dx_boxit 3 def
/dy_boxit 3 def
/linearc .05 def
/fillstyle {jaune fill} def
boxit
-2 1 [2 dup] cctexlabel

#tex# $$y = {\pi \over 2}$$
-5 pi 2 div dctexlabel
#tex# $$y = -{\pi \over 2}$$
5 pi -2 div uctexlabel

3 settailletangente
0 {f} tangente   

1.5 setlinewidth
gsave
   vert
   {pop pi 2 div} courbe
   {pop pi -2 div} courbe
   bleu
   {f} courbe
grestore

setTimesItalic
   (O) O drtext