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D( i )
1-i = 0
1-i = 0
1-i = 0
1-i = 0 // - 1
-i = -1 // * -1
i = 1
i in (-oo:1) U (1:+oo)
(1/(1-i))*((1-i)/(1-i)) = 0
1/(1-i) = 0
i belongs to the empty set
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