Find the unit tangent vector of the given curve.r(t) = (8 sin3 7t)i  + (8 cos3 7t)j

A. T(t) = (sin 7t)i  - (cos 7t)j
B. T(t) = (8 cos 7t)i  - (8 sin 7t)j
C. T(t) = (8 sin 7t)i  - (8 cos 7t)j
D. T(t) = (168 sin 7t)i  -(168 cos 7t)j


Answer: A

Mathematics

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