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Mathematics
Problem
Explain how the way
f
′
(
x
)
f'(x)
f
′
(
x
)
changes sign near
x
=
c
x=c
x
=
c
indicates that
(
c
,
f
(
c
)
)
(c,f(c))
(
c
,
f
(
c
))
is a local minimum of
f
f
f
. Keep your explanation to one or two sentences.
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