Find the unit tangent vector of the given curve.r(t) = (4 sin3 9t)i + (4 cos3 9t)j
A. T = (sin 9t)i - (cos 9t)j
B. T = (108 sin 9t)i -(108 cos 9t)j
C. T = (4 cos 9t)i - (4 sin 9t)j
D. T = (4 sin 9t)i - (4 cos 9t)j
Answer: A
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