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60. Consider the function f(x, y) = x² + y² + 2xy – x – y + 1 over the square 0 <= x<=1 and 0 <= y <= 1.

a. Show that f has an absolute minimum along the line segment 2x + 2y = 1 in this square. What is the absolute minimum value? b. Find the absolute maximum value of f over the square.

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