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Problem
Problem
Find the local maximum and local minimum of
f
(
x
)
=
x
3
+
3
x
f(x) = x^3 + 3x
f
(
x
)
=
x
3
+
3
x
in
[
−
2
,
4
]
[-2, 4]
[
−
2
,
4
]
.
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