I am trying to use MathCad to solve an implicit differentiation but I have no idea how I could do it. It seems to only solve a normal differentiation with only one variable.

I defined this...

f(x, y) := x^2 + y^2

and then differentiated it with respect to x but I get...

d(f(x, y)) / dx -> x^2

I thought I should expect..

d(f(x, y)) / dx -> x^2 + 2y(dy/dx)

How do I get MathCad to work properly with implicit differentiation?

Thanks!