If (x, y) moves from (x0, y0) to a point (x0+dx, y0+dy)
Chapter 13, Problem 20(choose chapter or problem)
If (x, y) moves from (x0, y0) to a point (x0+dx, y0+dy) nearby, how can you estimate the resulting change in the value of a dif-ferentiable function (x, y)? Give an example.
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