T<3sB
T< 
!
1
(0,)
2
xa
π
=∈ 
1
sin
nn
x x
+
=  p￡ lim 0
n
n
x
→∞
= b
￡
ü y
1
(0,)
2
xa
π
=∈ 
1
sin
nn
x x
+
= # 01
n
x< < b7
1
sin
n n
x xx
+
=<
[ {}
n
x ???h Oμ/? b?
^ {}
n
x
l ?b
! lim
n
n
x b
→∞
= 
1
sin
nn
x x
+
=

H |K¤ # 'sinb= b 0b = lim 0
n
n
x
→∞
= b

T< 
! 123
n
an=++++"￡
ü {
l ?b}
n
a
￡
ü A ? { ???9b
!}
n
a 111 1
n
b =++++"5 μ
?  V
¨B
,E￡
b O
Y
L

n
b
2
n
a≤
n
b
2
22 2
22
n
nn
ba= +++ ≥"b# { μ
? b?
^ {
l ?b
}
n
a
}
n
a

?  
4ù3s
1?B5? p￡ lim 1
3
n
n
n
x
→∞
= b
￡ 
22
2 1
22
1
222
1
1111
lim lim lim lim
11
33 3 3
nn
n
nnn n
nn
nnn
xx
x
x x
xxx
→∞ →∞ →∞ →∞
== =


22
11
22
11
sin1
lim
3sin
nn
n
nn
xx
x x

→∞

b7
22 4
22
00
3
00
2
0
sin
lim lim
sin ( sin ) ( sin )
lim lim
( sin ) sin
13
lim 3
21cos
xx
xx
x
xx x
x xxxx
xxxx
x
x
x
→→
→→
→
=
+
=?
+?
=? =

# lim 1
3
n
n
n
x
→∞
= 
?
^ lim 1
3
n
n
n
x
→∞
= b
1
2{ }
n
a 1,2,n="
^B?
b
k￡ ?
12
lim
n
n
aa a
a
n→∞
+ ++
= <∞
"

5 lim 0
n
n
a
n→∞
= b
￡ 
12 12 1
1
lim lim ( )
1
nn
nn
aaaaaaan
n
→∞ →∞
+++ +++?
=?
""
= 10aa=
2