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3. f(x, y) = 3x y + 5xy 4. f (x, y) = elxy In Exercises 111, calculate all four second-order partial derivatives and check
3. f(x, y) = 3x y + 5xy 4. f (x, y) = elxy
In Exercises 111, calculate all four second-order partial derivatives and check that f xy = f . Assume the variables are restricted to a domain on which the function is defined.
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