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D( X )
ln(X) = 0
X <= 0
ln(X) = 0
ln(X) = 0
ln(X) = ln(e^0)
X = e^0
X = 1
X <= 0
X in (0:1) U (1:+oo)
8/ln(X) = 0
t_1 = ln(X)
8/t_1 = 0
8*t_1^-1 = 0 // : 8
t_1^-1 = 0
t_1 należy do O
X belongs to the empty set
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