Question: Find the maximum of f(x,y) = x + y - x - y - xy

Find the maximum off(x,y) = x + y - x - y - xy

on the square, 0 x 2,0 y 2 (Figure 23). (a) First, locate the critical point of f in the square, and

f(x,y) = x + y - x - y - xy

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