Question: Find the absolute maximum and minimum points of the function f (x, y) = x2 + xy + y2 on the square with corners (1,

Find the absolute maximum and minimum points of the function f (x, y) = x2 + xy + y2 on the square with corners (1, 1), (1, 1), (1, 1), and (1, 1) (the boundary and its interior).

How to find the points?

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