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D( i )
4*i = 0
4*i = 0
4*i = 0
4*i = 0 // : 4
i = 0
i in (-oo:0) U (0:+oo)
(1-(8*i))/(4*i) = 0
(1-8*i)/(4*i) = 0
1-8*i = 0 // - 1
-8*i = -1 // : -8
i = -1/(-8)
i = 1/8
i = 1/8
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