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4. Let r(t)=(3cost,3sint,4t) be the position vector of a particle as a function of time t 2 0. a. Find the velocity of the particle

4. Let r(t)=(3cost,3sint,4t) be the position vector of a particle as a function of time t 2 0. a. Find the velocity of the particle as a function of time t. b. Find the arclength of its path between t=1 and t=2

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