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D( x )
x <= 0
e^6 = 0
x <= 0
e^6 = 0
e^6 = 0
e^6 = 0
x belongs to the empty set
x in (0:+oo)
x*(ln(x)/(e^6)) = 0
x = 0
ln(x)/(e^6) = 0
(1/(e^6))*ln(x) = 0 // : 1/(e^6)
ln(x) = 0
ln(x) = ln(e^0)
x = e^0
x = 1
x*(ln(x)/(e^6)) = 0 <=> x = 0 or x*(ln(x)/(e^6)) = 0 <=> ln(x)/(e^6) = 0
x in { 0}
x = 1
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