Question: Let f ( x , y ) = - 4 x 2 + 4 x y - y 2 . Here, D = 0 .

Let f(x,y)=-4x2+4xy-y2. Here, D=0.
Are the critical points saddle points, local minima, or local maxima?
cannot be determined
local maxima
saddle points
local minima
Let f ( x , y ) = - 4 x 2 + 4 x y - y 2 . Here, D

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