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D( i )
i+2 = 0
i+2 = 0
i+2 = 0
i+2 = 0 // - 2
i = -2
i in (-oo:-2) U (-2:+oo)
(4-i)/(i+2) = 0
4-i = 0 // - 4
-i = -4 // * -1
i = 4
i = 4
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