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Mathematics
Problem
A continuous function
f
f
f
is increasing on
(
−
4
,
1
)
(-4,1)
(
−
4
,
1
)
and decreasing on
(
1
,
5
)
(1,5)
(
1
,
5
)
. Determine the sign of
f
′
(
x
)
f'(x)
f
′
(
x
)
on each of these two intervals.
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