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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)
-1/ln(x) = 0.01 // - 0.01
-1/ln(x)-0.01 = 0
t_1 = ln(x)
-1/t_1-0.01 = 0
-1*t_1^-1 = 0.01 // : -1
t_1^-1 = -0.01
-1 < 0
1/(t_1^1) = -0.01 // * t_1^1
1 = -0.01*t_1^1 // : -0.01
-100 = t_1^1
t_1 = -100
ln(x) = -100
ln(x) = ln(e^-100)
x = e^-100
x = 0
x in { 0}
x belongs to the empty set
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