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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