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D( x )
x <= 0
x <= 0
x in (0:+oo)
(ln(x))^(1/3) = 0
t_1 = ln(x)
1*t_1^(1/3) = 0 // : 1
t_1^(1/3) = 0
t_1 = 0
ln(x) = 0
ln(x) = ln(e^0)
x = e^0
x = 1
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