Calculate the line integral
∫
�
�
(
�
,
�
,
�
)
�
�
for each of the following cases:
(
a
)
�
(
�
,
�
,
�
)
=
�
+
�
�
,
�
is the curve
�
=
�
2
,
�
=
3
�
,
�
=
�
for
1
≤
�
≤
2
.
(
b
)
�
(
�
,
�
,
�
)
=
�
�
,
�
is given by
�
2
+
�
2
=
1
,
�
≥
0
,
�
≥
0
,
�
=
0
.
(
c
)
�
(
�
,
�
,
�
)
=
�
2
+
�
�
,
�
is the straight line segment between
(
1
,
2
,
3
)
and