Soluzioni
a)
D
f
=
b)
D
f
=
c)
D
f
=
d)
D
f
=
e)
D
f
= [3,+
[
f)
D
f
=
g)
D
f
=
h)
D
f
= ]-
,1]
i)
D
f
=
l)
D
f
= ]-
,-1[U]1,+
[