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The local maximum value of the function f(x,y) = x2 + 2y2 − 2xy − 4y...

The local maximum value of the function f(x,y) = x2 + 2y2 − 2xy − 4y + 3 is

(A) −6 (B) 4 (C) −1 (D) 1 (E) 3 (F) none of (A) - (E)

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