Find the local maximum and minimum values and saddle point(s) of the function. If you have three-dimensional graphing software, graph the function with a domain and viewpoint that reveal all the important aspects of the function. (Enter your answers as a comma-separated list. If an answer does not exist, enter DNE.) f(x, y) xy - 4xy 8 128 local maximum value(s) X DNE local minimum value(s) X (x, y,n (0,0,4) saddle point(s) X

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