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D( x )
x <= 0
(ln(x))^2 = 0
x <= 0
(ln(x))^2 = 0
(ln(x))^2 = 0
t_1 = ln(x)
1*t_1^2 = 0 // : 1
t_1^2 = 0
t_1 = 0
ln(x) = 0
ln(x) = ln(e^0)
x = e^0
x = 1
x in (0:1) U (1:+oo)
(ln(x)-1)/((ln(x))^2) = 0
k_1 = ln(x)
(k_1-1)/(k_1^2) = 0
k_1-1
ln(x)-1 = 0 // + 1
ln(x) = 1
ln(x) = ln(e^1)
x = e^1
x = e
x = e
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