OCW Scholar - Multivariable Calculus 47 Online
OpenStudy (anonymous):

For d2f/(dxdy), do we take the derivate of f with respect to y first, or with respect to x first? For fxy, do we take the derivate of f with respect to y first, or with respect to x first?

OpenStudy (anonymous):

For d2f/dxdy, it's the same as d/dx(df/dy) so take the derivative of f with respect to y first. For the second one, fxy, take derivative w.r.t. x first.

OpenStudy (anonymous):

IT DOES NOT MATTER GO LOOK AT BERNOULLIS PROOF OF PARtial derivitives

OpenStudy (anonymous):

They are the same.

OpenStudy (anonymous):

They are not quite the same. Just remember the assumptions in the proof that \[f_{xy} = f_{yx}\]Don't just memorise the formulas when doing your applications but forget the full statement of the theorem.

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