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D( i )
i = 0
i = 0
i = 0
i in (-oo:0) U (0:+oo)
3/4 = 15/i // - 15/i
3/4-(15/i) = 0
3/4-15*i^-1 = 0
-15*i^-1 = -3/4 // : -15
i^-1 = 1/20
-1 < 0
1/(i^1) = 1/20 // * i^1
1 = 1/20*i^1 // : 1/20
20 = i^1
i = 20
i = 20
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