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im not sure how to find the pairs in question b. Some explanations along is appreciated SM 12. Let f be defined for all (x,

im not sure how to find the pairs in question b. Some explanations along is appreciated

SM 12. Let f be defined for all (x, y) by f (x, y) = x4 + 2y2 - 4x2y + 4y. (a) Find fi (x, y) and f2 (x, y). (b) Find all pairs (x, y) which solve both equations fi (x, y) = 0 and fi (x, y) = 0. z = f(x, y) -X Figure 14.R.1 Review Exercise 13

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