For the curve r(t), write the acceleration in the form aTT + aNN.r(t) = (4t sin t + 4 cos t)i + (4t cos t - 4 sin t)j + 9k
A. a = 
N
B. a = 4tN
C. a = 4T + 
N
D. a = 4T + 4tN
Answer: D
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