# When to use the Chain Rule

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The key is whether or not you are plugging the result of a function into another function. The idea is shown by contrasting the procedures for taking the derivatives of sin(x^2) and x^2*sin(x).

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If anywhere in the problem the result of a function is put into another function, then you will be using the Chain Rule.

If you look at the problem , your variable, , is ...

#### Solution Summary

The usage of the Chain Rule with reference to a specific derivative is discussed.

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