# Using Leibniz Notation

Some things to remember for implicit differentiation:

- Since
*y*is a function of*x*, any derivative involving*y*must use the chain rule.

- Since
*y*is a function of*x*, taking the derivative of*xy*(or of any other product involving both*x*and*y*) requires the product rule.

- Since
*y*is a function of*x*, taking the derivative of (or any other quotient involving both*x*and*y*) requires the quotient rule.

With these things in mind, we're ready to get cracking.

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