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D( i )
2-i = 0
2-i = 0
2-i = 0
2-i = 0 // - 2
-i = -2 // * -1
i = 2
i in (-oo:2) U (2:+oo)
(6-i)/(2-i) = 0
6-i = 0 // - 6
-i = -6 // * -1
i = 6
i = 6
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