A pendulum on a grandfather clock is swinging back and forth as it keeps time. A device is measuring the distance the pendulum is above the floor as it swings back and forth. At the beginning of the measurements the pendulum is at its highest point, 36cm high. Exactly one second later, it is at its lowest point of 12cm. One second later, it was back to its highest point, again.
A. Use the information above to sketch a diagram of this sinusoidal movement.
B. Write the sinusoidal equation (sine and cosine) that describes this situation.