T
2
m
(
x,
0) =
T
2
m
+1
(
x,
0) = 1
-
x
2
+
x
4
-
x
6
+
. . .
+ (
-
1)
m
x
2
m
;
f
(2
m
)
(0) = (
-
1)
m
(2
m
)!
,
f
(2
m
+1)
(0) = 0
;
m
= 0
,
1
,
2
,
. . .
.