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If the point (2.0) is a critical point for the function f(x,y)=x - y - 3x? - 3y - 2. then f(2,0) is: a local maximum not a local maximum or minimum an absolute minimum CO a local minimum DO If the point(0, 1) is a critical point for the function f(x,y)=xy (1 -x-y), then f0,1) is: not a local maximum or minimum AO a local minimum a local maximum an absolute maximum DO