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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)
ln(15)/ln(x) = 0
t_2 = ln(x)
ln(15)/t_2 = 0
ln(15)*t_2^-1 = 0 // : ln(15)
t_2^-1 = 0
t_2 należy do O
x belongs to the empty set
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