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D( i )
i = 0
i = 0
i = 0
i in (-oo:0) U (0:+oo)
(4-(5*i))/i = 0
(4-5*i)/i = 0
4-5*i = 0 // - 4
-5*i = -4 // : -5
i = -4/(-5)
i = 4/5
i = 4/5
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