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In Exercises 9–12, an object moves along the x-axis so that its posi-
tion at any time t2 0 is given by x(1) = s(1). Find the velocity of the
object as a function of t.
9. s = cos
2
10. s = t cos (T – 41)
3t
4
sin 31 +
37
4
cos 51
11. s
12. s = sin
-t|+ cos
4

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