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Mathematics
Mathematics
Problem
Let
f
f
f
be twice differentiable on an interval. Suppose
f
′
′
(
x
)
<
0
f''(x)<0
f
′′
(
x
)
<
0
for every
x
x
x
in
(
−
2
,
5
)
(-2,5)
(
−
2
,
5
)
. Identify the concavity of the graph of
f
f
f
on that interval.
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