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Let S =           number real a is i 2 z 4 i 3 z 2 : iy x z . Then which of the following is NOT correct?

1. y + x 2 + y 2  – 4 1
2. (x, y) =        2 1 , 0
3. x = 0
4. y                    , 2 1 2 1 ,

Correct answer: (x, y) =        2 1 , 0

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