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D( i )
30*i = 0
30*i = 0
30*i = 0
30*i = 0 // : 30
i = 0
i in (-oo:0) U (0:+oo)
(3-(6*i))/(30*i) = 0
(3-6*i)/(30*i) = 0
3-6*i = 0 // - 3
-6*i = -3 // : -6
i = -3/(-6)
i = 1/2
i = 1/2
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