For the curve r(t), write the acceleration in the form a+T+aNN. r(t) = (6t sin t+ 6 cos t)i + (6t cost - 6 sin t)j + 7k OA. a = 6tN 1 OB. a=6T+N 6t O c. a=6T+6tN 1 OD. a = N 6t

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