%% auteur : Abidi
200 setheight
200 setwidth
20 setxunit
20 setyunit
-8 8 setxrange
-2 12 setyrange

pi 2 exp ytick
#latex# $\pi^2$
0 pi 2 exp cltexlabel
-3 pi mul xtick
#latex# $-3\pi$
-3 pi mul 0 dctexlabel
-2 pi mul xtick
#latex# $-2\pi$
-2 pi mul 0 dctexlabel
-1 pi mul xtick
#latex# $-\pi$
pi neg 0 dctexlabel
1 pi mul xtick
#latex# $\pi$
pi 0 dctexlabel
2 pi mul xtick
#latex# $2\pi$
2 pi mul 0 dctexlabel
3 pi mul xtick
#latex# $3\pi$
3 pi mul 0 dctexlabel
#latex# $0$
0 0 dltexlabel
traceaxes
axeOxarrow
axeOyarrow

/f1 {2 pi mul add 2 exp} def
/f2 {2 exp} def
/f3 {2 pi mul sub 2 exp} def

bleu
-3 pi mul pi neg {f1} (-) Courbe
pi neg pi {f2} (-) Courbe
pi 3 pi mul {f3} (-) Courbe

#latex# $f$
2 4 ultexlabel