Consider the vector function given below. r(t) =   7t, 5 cos(t), 5 sin(t)   (a) Find the unit tangent and unit normal vectors T(t) and N(t). T(t)  = N(t) (b) Use the formula  ?(t) =  |T ′(t)| |r ′(t)| to find the curvature. ?(t) =

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