18 setfontsize
-5 5 setxrange
-5 5 setyrange

/f {
   cotanh
} def

40 setxunit
[1 1 .5 .5 .1 .1] {orange} Quadrillage
tracerepere
marks

gsave
   bleu
   1.75 setlinewidth
   xmin -.1 {f} Courbe
   .1 xmax {f} Courbe
grestore

setTimesItalic
   (O) O drtext

<tex>
$$
   y = {\rm coth} x
$$
</tex>

/dx_boxit 3 def
/dy_boxit 3 def
/linearc .05 def
/fillstyle {jaune fill} def
boxit
-3.5 2.5 [2 dup] cctexlabel