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