The chain rule states that the derivative of f(g(x)) is f'(g(x))g'(x). In other words, it helps us differentiate composite functions. For example, sin(x) is a composite function because it can be constructed as f(g(x)) for f(x)=sin(x) and g(x)=x_. Using the chain rule and the derivatives of sin(x) and x_, we can then find the derivative of sin(x_). Created by Sal Khan.
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