Question

Prove:
psi(x,y) = psi(x,y(x))
d{psi}/dx=delta{psi}/delta{x} + delta{psi}/delta{x}*dy/dx
Where delta stands for the partial derivative symbol.

Answer 1

Foiled again...!\[d{\psi}/dx=\delta{\psi}/\delta{x} + \delta{\psi}/\delta{y}*dy/dx\]

Where delta stands for the partial derivative symbol

Answer 2

For the curious, this is at the level of differential equations.