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D( j )
j = 0
j = 0
j = 0
j in (-oo:0) U (0:+oo)
2.8/j = 1.3/2.71 // - 1.3/2.71
2.8/j-(1.3/2.71) = 0
2.8/j-0.4797048 = 0
2.8*j^-1 = 0.4797048 // : 2.8
j^-1 = 0.17132314
-1 < 0
1/(j^1) = 0.17132314 // * j^1
1 = 0.17132314*j^1 // : 0.17132314
5.83692314 = j^1
j = 5.83692314
j = 5.83692314
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