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Problem
Problem
Find the interval in which
f
(
x
)
=
x
3
−
3
x
2
−
9
x
+
20
f(x) = x^3 - 3x^2 - 9x + 20
f
(
x
)
=
x
3
−
3
x
2
−
9
x
+
20
is strictly increasing or strictly decreasing.
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