Find the unit tangent vector of the given curve.r(t) = (9t cos t - 9 sin t)j + (9t sin t + 9 cos t)k
A. T(t) = (-9 sin t)j + (9 cos t)k
B. T(t) = - 
(sin t)j + 
(cos t)k
C. T(t) = (9 cos t)j - (9 sin t)k
D. T(t) = (-sin t)j + (cos t)k
Answer: D
Mathematics
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