text consider the function f x y 3 x 2 2 y 2 2 x y 2 x 2 y 1 text defi
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\text { Consider the function } f(x, y)=3 x^{2}+2 y^{2}+2 x y-2 x-2 y+1 \text { defined on the } closed domain D {(x, y) x ≥ 0, y ≥ 0,x+y≤ 1}. Find the maximal and minimal values.
