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SM 12. Let f be defined for all (x, y) by f(x, y) = x4 + 2y2 - 4x2y + 4y. (a) Find fi (x,

SM 12. Let f be defined for all (x, y) by f(x, y) = x4 + 2y2 - 4x2y + 4y. (a) Find fi (x, y) and f (x, y). (b) Find all pairs (x, y) which solve both equations fi (x, y) = 0 and f; (x, y) = 0

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