a)
T
2
=
+
(
x
+ 1)
,
R
3
=
e
t
(
x
-
t
)
2
dt
=
e
(
x
+ 1)
3
; b)
T
2
=
+
(
x
-
) +
(
x
-
)
2
,
R
3
=
(
x
-
t
)
2
dt
=
(
x
-
)
3
.