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D( x )
x <= 0
ln(x) = 0
x <= 0
ln(x) = 0
ln(x) = 0
ln(x) = ln(e^0)
x = e^0
x = 1
x in (0:1) U (1:+oo)
5/ln(x) = 0
t_1 = ln(x)
5/t_1 = 0
5*t_1^-1 = 0 // : 5
t_1^-1 = 0
t_1 należy do O
x belongs to the empty set
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