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see attached -3y Let f : R - R be defined as f(x, y) = 1 + x2+ 12 (a) Classify the level curves f

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-3y Let f : R - R be defined as f(x, y) = 1 + x2+ 12 (a) Classify the level curves f (x, y) = k for k # 0. [HIT: Complete squares] (b) Use your result of (a) to find the range of f

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