Second order partial derivative of f(x,y)

Question

Write all the possible second order partial derivatives of the function of two variables f(x,y).

Answer 1

Write second order partial derivatives of the function.

​(∂/∂​​x)(∂f/∂x) = ∂^2f/∂x^2

(∂/∂​​x)(∂f/∂y) =∂^2f/∂x∂y

(∂/∂​​y)(∂f/∂x) =∂^2f/∂y∂x

(∂/∂​​y)(∂f/∂y) =∂^2f/∂y^2