Find the unit tangent vector of the given curve.r(t) = (5t cos t - 5 sin t)j + (5t sin t + 5 cos t)k
A. T = (-sin t)j + (cos t)k
B. T = (5 cos t)j - (5 sin t)k
C. T = - 
(sin t)j + 
(cos t)k
D. T = (-5 sin t)j + (5 cos t)k
Answer: A
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x
A. - 
B. 
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