Evaluate the vector-valued function at each given value of t. (If an answer does not exist, enter DNE.) r(t) = cos(t)i + 3 sin(t)j %3D (a) r(0) = i %3D 3 i+ (b) r(T/4) = (c) r(@ - T) =-cos(0)i – 3 sin(0)j %3D (d) r(n/6 + At) – r(1/6) =

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