This is when “y” is not isolated. We are used to seeing y=2x +1 (explicit diff), however there are instances where y+1=2x (implicit diff). In implicit differentiation, our objective is to isolate the “y” by 1) Deriving both sides of the equations (note: we ALWAYS use chain rule to derive y). 2) Then isolating y’.
How to Do Implicit Differentiation (cr: NancyPi)
Implicit Differentiation (cr: Professor Dave)