# Using Lagrange Notation

Things to remember for implicit differentiation:

*x'*= 1

- 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

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