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Evaluate (if possible) the vector-valued function at each given value of t. (If you need to...

Evaluate (if possible) the vector-valued function at each given value of t. (If you need to use Δt, enter Deltat.)

r(t) = 1/2t2i − (t − 9)j

Evaluate (if possible) the vector-valued function at each given value of t. (If an answer does not exist, enter DNE.)

r(t) = cos(t)i + 9 sin(t)j

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