If r(t) is the position vector of a particle in the plane at time t, find the indicated vector.Find the acceleration vector.r(t) = (4 cos t)i + (8 sin t)j
A. a = (-4 cos t)i + (-8 sin t)j
B. a = (4 sin t)i + (8 cos t)j
C. a = (4 cos t)i + (8 sin t)j
D. a = (-4 sin t)i + (-8 cos t)j
Answer: A
Mathematics
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A. 
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B. 
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A. 
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