Some two-variable relationships cannot be turned into a function, like the circle equation x²+y²=4. Implicit differentiation allows us to find the derivative of y with respect to x, even in such equations.
5119_Showing_explicit_and_implicit_differentiation_give_same_result.html
5118_Finding_slope_of_tangent_line_with_implicit_differentiation.html
All video content by Khan Academy is under their license: CC by NC SA
Website created using Khan Academy Static Downloader