6
a
F
1
(
x
)
G
1
(
x
)
F
2
(
x
)
G
2
(
x
)
F
3
(
x
)
G
3
(
x
)
F
4
(
x
)
G
4
(
x
)
9
-3
ln (1 +
x
)
arctg
x
cos
x
e
x
arctg
x
arctg
x
e
x
e
x