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  3. 1 prove that the set dz v e r2 1...

Question: 1 prove that the set dz v e r2 1...

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1. Prove that the set D,-{(z, v) E R2 |-1 <エく1) is a region and that the set D,-{(z.ve R2 1-1 < x < 1,2关0} is not a region.
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