! "#
Æ
!
" #$ $ % # & '
(
'
) (
+
*
'
+ ,
*
Æ
0
-
&$ /+$
-
/+
0-
1 + &
Ê
Æ Æ
Æ
$ %
-
.
*
#$ %-
&
Ê
Æ
-
4 3 2 1 –3
–2
0
–1
1
2
x
3
–1 –2 1
1 +
Æ
- +
" ) 0 "2
" '(
-
&$ /+$
-
/+
-
1 +
Ê
&
&
Ê
Æ
0-
# & # & $
"
4 3 2 1 –3
–2
0
–1
1
x
2
3
–1 –2 –3
/
1 +
Æ
" ) 2
- +
)
/+
-
-
Ê
&
-
)
Æ
0-
4
3
2
1
–2
0
–1
/
1 +
1 x
2
Æ
- +
" 3
0.8 0.6 0.4 –6
–4
–2
0.2
2
x 4
6
0 –0.2 –0.4 –0.6 –0.8 –1 /
1 +
-
Æ
+
3
" 3 4
! &
'
Æ (
# % #
- &$ 5
- % /+ " , %- ) , %-
Æ 6" )7
Æ 6 "7
$ %
/ 8
.
-
09
-
09
3
)
-
"
"
"
9
-
"
' &$ /+
2
0
" /
1 + 6" )7-
0
-
.
) '
/+
.
"
0-
Æ 6" )7
- &$ Æ 6 "7
:
6
"7
0.4 0.2
–2
0
–1
1 x
2
–0.2 –0.4
%
0.4
0.3
0.2
0.1
0 2
2.2
2.4
x
2.6
/
1 +
2.8
0 " ) 3 2 ;
Æ
6" )7- +
;
3
0.5 0.4 0.3 0.2 0.1
0
0.6
0.8
1
1.2 x
1.4
1.6
1
1 + +
<
1.8
2 Æ 6 "7-
" 2 0 "0
! &
Æ
# %-
-
" # % &$ ( /+
!
) 1
Æ
!
3 1
Æ
60 7 !
$ %
' =
- - =
" >
'
:
-
4-
3
) ' &$ ( /+ 1 +
:
60 7
4
?
.
4
?
0-
-
-
Æ 60 7
4 2 –4
2 x
–2
4
0 –2 –4 –6 –8 % / &
?
/+
! &
# %
"
+$
"
Æ
Æ
@$ &$
Æ /+$ +$
" A %-
-
% +$
Æ
Æ +$
Æ
" 7
$ % Æ
'
-
' /+ "
"
"
" 7
Æ
-
0-
0 0
0-
"
-
" "-
"
-
Æ
" "
"
:
Æ
" "
B
" 7
"
"
"
"
-
&
-
0
"
"
0-
Æ
" 7
! &'
Æ
/
)
Æ - (
+$ 5
- % 1 +
)
A % @$ - $ +$
)
- +
Æ
Æ
" 1
Æ
!
$ %
Æ
'
)
"
C
"
"
" )
)
&
)
)
"
)
"
" "
¾
"
"
? Æ
" ?
)
3
1 +
)
)
¾
?
)
0
Æ
)
3
"
-
"
?
"
"