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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)
(ln(x)+ln(2))/ln(x) = 0
k_1 = ln(x)
(k_1+ln(2))/k_1 = 0
k_1+ln(2)
ln(x)+ln(2) = 0 // - ln(2)
ln(x) = -ln(2)
x = 1/2
x = 1/2
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