A describing function is a mathematical tool used in control theory and nonlinear system analysis. It provides a way to analyze and approximate the behavior of nonlinear systems by converting the nonlinear elements into equivalent linear representations over a specific range of input amplitudes. ### Key Concepts: 1. **Nonlinear Systems**: Many real-world systems exhibit nonlinear behavior, where the output is not proportional to the input. These systems can be challenging to analyze using traditional linear control techniques.
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