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D( x )
x <= 0
x = 0
ln(x) = 0
x <= 0
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)
(2/x)*(1/ln(x)) = 0
2/x = 0
2*x^-1 = 0 // : 2
x^-1 = 0
x należy do O
1/ln(x) = 0
t_2 = ln(x)
1/t_2 = 0
1*t_2^-1 = 0 // : 1
t_2^-1 = 0
t_2 należy do O
(2/x)*(1/ln(x)) = 0 <=> 2/x = 0 or (2/x)*(1/ln(x)) = 0 <=> 1/ln(x) = 0
x belongs to the empty set
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