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13. (a) (1 pt) Define the vector-valued function 7 (t) = sint i + cos tj + (t 1) k. b) (1 pt) Find the

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13. (a) (1 pt) Define the vector-valued function 7 (t) = sint i + cos tj + (t 1) k. b) (1 pt) Find the unit tangent vector T (t). c) (1 pt) Find the acceleration .' (t)

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