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