Part II. Calculating Second Order Partial Derivatives. Find all the second order partial derivatives for the following: 1. f(x, y) = x + y + xy 2. f(x, y) = sin xy 3. g(x, y) = x²y + cos y + y sin x 4. h(x, y) = xe +y+1 5. r(x, y) = ln (x + y)

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