Question: Show that the mixed partial derivatives xyy , yxy , and yyx are equal. f(x, y, z) = 2z x + y

Show that the mixed partial derivatives ƒxyy, ƒyxy, and ƒyyx are equal.

f(x, y, z) = 2z x + y 

f(x, y, z) = 2z x + y

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