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D( i )
i = 0
i = 0
i = 0
i in (-oo:0) U (0:+oo)
28/i = 1.3/2.71 // - 1.3/2.71
28/i-(1.3/2.71) = 0
28/i-0.4797048 = 0
28*i^-1 = 0.4797048 // : 28
i^-1 = 0.01713231
-1 < 0
1/(i^1) = 0.01713231 // * i^1
1 = 0.01713231*i^1 // : 0.01713231
58.36924501 = i^1
i = 58.36924501
i = 58.36924501
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