👉 In calculus, a derivative is a function that describes how one quantity changes in response to its own input. It is a measure of rate of change and is often used to find instantaneous rates of change or slopes at specific points on a curve. Derivatives can be defined using different methods depending on the context. For example, if we are looking for derivatives of functions that involve trigonometric functions (such as sine and cosine), then we use the chain rule. If we are looking for derivatives
