Always take the chain rule for derivatives

Sometimes, if you take the derivative with respect to the variable in the expression (and there is only one variable), you can ‘not’ use it since, for example, dx/dx = 1. But in general, you use the chain rule for derivatives.

Reviewing for the final, we started with the earlier version of a derivative which involved limits.

The letter ‘a’ is used sometimes to denote a constant.

With multiple variables, the chain rules becomes even more important.

The general approach for a problem involving changing dimensions of a rectangle was to find an expression for a particular characteristic and then take the derivative. Certain rates were known in the problem.

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