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Assume that the position of a particle at time t is given by the path r(t) = (sin(9t), cos(2t), cos(7t)). Find the speed v

Assume that the position of a particle at time t is given by the path r(t) = (sin(9t), cos(2t), cos(7t)). Find the speed v of the particle at time t = (Use symbolic notation and fractions where needed.) "6) =

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