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Mathematics
Problem
Let
f
f
f
be a differentiable function with
f
′
(
x
)
=
3
x
2
−
12
x
f'(x)=3x^{2}-12x
f
′
(
x
)
=
3
x
2
−
12
x
. Determine the open interval(s) on which
f
f
f
is decreasing.
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