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Mathematics 7 Online
OpenStudy (anonymous):

how many third order partial derivative of two variable function have?

OpenStudy (kainui):

Well since order of differentiation doesn't really matter, we know \[\LARGE f_{xy}=f_{yx}\] So those are really just representing only 1 of the 3 possible different second order partial derivatives. So if we just step it up a notch, what do we get?

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