Question

What is happening in example 2?
http://tutorial.math.lamar.edu/Classes/CalcIII/HighOrderPartialDerivs.aspx

Answer 1

Is F_y & F_x being multiplied? I don't see the connection

Answer 2

How does the mixed second order partial derivatives come about?

Answer 3

\[\Large\rm f=xe^{-x^2y^2}\]

Answer 4

The mixed partials?
From taking a second derivative.

Answer 5

\[\Large\rm f_y=-2x^3ye^{-x^2y^2}\]

Answer 6

thanks, I see it now

Answer 7

Oh ok :) hehe