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Problem
Problem
Find the interval of increase or decrease of the
f
(
x
)
=
∫
−
1
x
(
t
2
+
2
t
)
(
t
2
−
1
)
d
t
f(x) = \textstyle\int_{-1}^{x} (t^2 + 2t)(t^2 - 1) dt
f
(
x
)
=
∫
−
1
x
(
t
2
+
2
t
)
(
t
2
−
1
)
d
t
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