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The equation r(t) = (3t+9)i+ (5t)j + (2) k is the position of a particle in space at time t. Find the angle between

The equation r(t) = (3t+9)i+ (5t)j + (2) k is the position of a particle in space at time t. Find the angle between the velocity and acceleration vectors at time t = 0. The angle is radians. (Type an exact answer, using as needed.)

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