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) = (cos 4t)i + (5 sin t)j
A) a = (-4 cos 4t)i + (5 sin t)j
B) a = (-16 cos 4t)i + (-5 sin t)j
C) a = (-16 cos 4t)i + (-25 sin t)j
D) a = (16 cos 4t)i + (-5 sin 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) = (cos 4t)i + (5 sin t)j
A) a = (-4 cos 4t)i + (5 sin t)j
B) a = (-16 cos 4t)i + (-5 sin t)j
C) a = (-16 cos 4t)i + (-25 sin t)j
D) a = (16 cos 4t)i + (-5 sin t)j

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