Chain Rule

In calculus, the chain rule is a formula for computing the derivative of the composition of two or more functions. That is, if f is a function and g is a function, then the chain rule expresses the derivative of the composite function f ∘ g in terms of the derivatives of f and g.

In integration, the counterpart to the chain rule is the substitution rule.

Read more about Chain Rule:  History, The Chain Rule in Higher Dimensions, Further Generalizations

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