Find the unit tangent vector of the given curve.r(t) = (7 sin3 5t)i + (7 cos3 5t)j
A. T = (7 cos 5t)i - (7 sin 5t)j
B. T = (105 sin 5t)i -(105 cos 5t)j
C. T = (sin 5t)i - (cos 5t)j
D. T = (7 sin 5t)i - (7 cos 5t)j
Answer: C
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