Explanation:
A feedback control system is a system that uses feedback to adjust its output and maintain a desired state. The output of a feedback control system is determined by multiple factors, including the reference input, the feedback signal, and the input signal.

Reference Input:
The reference input is the desired value or setpoint that the system is trying to achieve. It represents the desired state or behavior that the system should exhibit. The output of the feedback control system is influenced by the reference input as it determines the goal or target for the system.

Feedback Signal:
The feedback signal is obtained by measuring the actual output or behavior of the system. It provides information about the current state of the system and is used to compare with the reference input. The difference between the feedback signal and the reference input is known as the error signal. The feedback signal is an important factor in determining the output of the feedback control system because it allows the system to adjust and correct its behavior based on the error signal.

Input Signal:
The input signal represents the external influence or disturbance on the system. It can be considered as the external command or stimulus that affects the system's behavior. The input signal may cause the system to deviate from its desired state, and the feedback control system must respond to these disturbances to maintain stability and achieve the desired output.

Output:
The output of the feedback control system is a function of both the input signal and the feedback signal. The input signal contributes to the overall behavior of the system, while the feedback signal provides information about the system's current state. By combining these two signals, the feedback control system can adjust its output to minimize the error signal and achieve the desired state.

In conclusion, the output of a feedback control system is a function of the input signal and the feedback signal. The reference input is used as a target or goal for the system, while the feedback signal provides information about the system's current state. By analyzing and combining these signals, the feedback control system can adjust its output to maintain stability and achieve the desired behavior.