Find the absolute maximum and minimum values off on the set D. f(x , y) = x + y - xy, D is the closed triangular region

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#1

Find the absolute maximum and minimum values off on the set D.
f(x , y) = x + y - xy, D is the closed triangular region with vertices (0, 0), (0 , 2) , and (4 , 0)

Answer:

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