n
1
s
h
o
w
g
r
a
p
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f
1
2
x
+
1
2
x
-
x
r
e
s
e
t
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n
t
e
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r
a
t
i
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n
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i
m
i
t
s
T
r
a
d
i
t
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n
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l
F
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m
1
∫
-
1
f
1
[
x
]
x
,
N
u
l
l
=
1
.
▮
▮