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D( x )
8*x <= 0
ln(8*x) = 0
8*x <= 0
8*x <= 0
8*x+0 <= 0 // - 0
8*x <= 0 // : 8
x <= 0/8
x <= 0
ln(8*x) = 0
ln(8*x) = 0
ln(8*x) = ln(e^0)
8*x = e^0
8*x-e^0 = 0
8*x-1 = 0 // + 1
8*x = 1 // : 8
x = 1/8
x in (0:1/8) U (1/8:+oo)
1/ln(8*x) = 0
t_1 = ln(8*x)
1/t_1 = 0
1*t_1^-1 = 0 // : 1
t_1^-1 = 0
t_1 należy do O
x belongs to the empty set
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