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) = (6 cos t)i + (9 sin t)j
A) a = (6 cos t)i + (9 sin t)j
B) a = (-6 cos t)i + (-9 sin t)j
C) a = (-6 sin t)i + (-9 cos t)j
D) a = (6 sin t)i + (9 cos t)j

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The Answer of 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) = (6 cos t)i + (9 sin t)j
A) a = (6 cos t)i + (9 sin t)j
B) a = (-6 cos t)i + (-9 sin t)j
C) a = (-6 sin t)i + (-9 cos t)j
D) a = (6 sin t)i + (9 cos t)j

If R(t) Is the Position Vector of a Particle in the Plane