The harmonic motion function d (t) = 4cos(3 t), in which dis measured in centimeters and tis measured in seconds, gives the distance a swinging pendulum is from its resting position at time t. How far was the pendulum from its resting position when the motion began? What is the period of the pendulum's motion? How far is the pendulum from its resting position after 4.5 seconds?

The harmonic motion function d (t) = 4cos(3 t), in which dis measured in centimeters and tis measured in seconds, gives the distance a swinging pendulum is from its resting position at time t. How far was the pendulum from its resting position when the motion began? What is the period of the pendulum's motion? How far is the pendulum from its resting position after 4.5 seconds?