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D( i )
(4-(4*i))^2 = 0
(4-(4*i))^2 = 0
(4-(4*i))^2 = 0
(4-4*i)^2 = 0
4-4*i = 0 // - 4
-4*i = -4 // : -4
i = -4/(-4)
i = 1
i in (-oo:1) U (1:+oo)
i/((4-(4*i))^2)+5 = 0
i/((4-4*i)^2)+5 = 0
i/((4-4*i)^2)+(5*(4-4*i)^2)/((4-4*i)^2) = 0
5*(4-4*i)^2+i = 0
80*i^2-159*i+80 = 0
80*i^2-159*i+80 = 0
80*i^2-159*i+80 = 0
DELTA = (-159)^2-(4*80*80)
DELTA = -319
DELTA < 0
1 = 0
1/((4-4*i)^2) = 0
1/((4-4*i)^2) = 0 // * (4-4*i)^2
1 = 0
i belongs to the empty set
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