Which of the following use of cases covers all possibilities when there are two real variables x and y, and the domain is R?
Case 1: x > 0 and y > 0
Case 2: x < 0 and y < 0
Case 3: x = 0 and y = 0
Case 1: x not 0
Case 2: y not 0
Case 3: x = 0 and y = 0
Case 1: x not 0 and y not 0
Case 2: x = 0 and y = 0
Case 1: x = 0
Case 2: y = 0
case 3: x not zero and y not 0

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Im guessing the R is to represent all real numbers, right?

Yes.. R is the notation of real number

what's your opinion regarding all the choices? For myself, it is either the second or the fourth one

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