I
n
[
]
:
=
f
[
x
1
_
,
x
2
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]
:
=
(
x
1
^
n
+
x
2
^
n
)
^
(
1
/
n
)
;
L
i
m
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t
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f
[
x
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,
x
2
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,
n
∞
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O
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x
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f
L
o
g
[
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&
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L
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&
L
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