Question: do not use second deriv test. will give like for answer. f(x,y)=4xy2x2y2xy3 on D, where D is the closed triangular region in the xy plane

f(x,y)=4xy2x2y2xy3 on D, where D is the closed triangular region in the xy plane with vertices (0,0),(0,6),(6,0). Find the absolute maximum and minimum values of the following functions on the given closed domains. Your answer should include a sketch of the domain, with all critical points in the interior and on the boundary
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