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Mathematics
Problem
Let
f
(
x
)
=
x
3
−
3
x
2
−
9
x
+
5
f(x)=x^{3}-3x^{2}-9x+5
f
(
x
)
=
x
3
−
3
x
2
−
9
x
+
5
. Determine the open interval(s) on which
f
f
f
is decreasing.
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