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D( x )
x <= 0
8*x = 0
x <= 0
8*x = 0
8*x = 0
8*x = 0 // : 8
x = 0
x in (0:+oo)
ln(x)/(8*x) = 0
ln(x)/(8*x) = 0 // * 8*x
ln(x) = 0
ln(x) = ln(e^0)
x = e^0
x = 1
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