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Mathematics
Problem
For answers and explanations, turn to Chapter 19. 12. If the position function of a particle is
x
(
t
)
=
t
t
2
+
9
,
t
>
0
x(t)=\frac{t}{t^{2}+9}, t>0
x
(
t
)
=
t
2
+
9
t
,
t
>
0
, find when the particle is changing direction.
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