F(X) = LN(X+√1 +X2).X∞ZΑ(Α−1). . .(Α−N+ 1)XHD
6)
f(x) = ln(x
+
√
1 +
x
2
).
x
∞
Z
α(α
−
1)
. . .
(α
−
n
+ 1)
X
HD :
f(0),
f
0
(x) = (1 +
x
2
)
−
1
2
,
f
0
(x) =
n!
t
2n
dt,
với
0
α
=
−
1
6)
f(x) = ln(x
+
√
1 +
x
2
).
x
∞
Z
α(α
−
1)
. . .
(α
−
n
+ 1)
X
HD :
f(0),
f
0
(x) = (1 +
x
2
)
−
1
2
,
f
0
(x) =
n!
t
2n
dt,
với
0
α
=
−
1