In exercises 27–30, use the position function to find the velocity at time t = to. Assume units of feet and seconds. 27. s(t) = t² – sin 2t, to = 0 28. s(t) = 4+ 3 sin t , to = IT cos t 29. s(t) = to = JT 30. s(t) = t cos(t2 +1), to = 0

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