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D( x )
x <= 0
x = 0
x <= 0
x = 0
x = 0
x in (0:+oo)
(1/x)*ln(x) = 0
1/x = 0
1*x^-1 = 0 // : 1
x^-1 = 0
x należy do O
ln(x) = 0
ln(x) = ln(e^0)
x = e^0
x = 1
(1/x)*ln(x) = 0 <=> 1/x = 0 or (1/x)*ln(x) = 0 <=> ln(x) = 0
x = 1
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