Mathematics

Mathematics

Problem

The graph of the relation xy=1xy=1 consists of two branches. For which interval of xx-values is the curve concave upward? a) (−∞,−1)∪(1,∞)(-\infty,-1)\cup(1,\infty) b) (0,∞)(0,\infty) c) (−∞,0)(-\infty,0) d) (−∞,0)∪(0,∞)(-\infty,0)\cup(0,\infty)

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