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Problem
Problem
Let
f
(
x
)
=
x
+
1
x
f(x) = x + \frac{1}{x}
f
(
x
)
=
x
+
x
1
,
x
≠
0
x \ne 0
x
=
0
. Discuss the maximum and minimum value of
f
(
x
)
f(x)
f
(
x
)
.
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