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D( x )
x <= 0
x = 0
x <= 0
x = 0
x = 0
x in (0:+oo)
8*(1/x)*ln(x) = 0
8*(1/x) = 0
8*x^-1 = 0 // : 8
x^-1 = 0
x naleu017Cy do O
ln(x) = 0
ln(x) = ln(e^0)
x = e^0
x = 1
8*(1/x)*ln(x) = 0 <=> 8*(1/x) = 0 or 8*(1/x)*ln(x) = 0 <=> ln(x) = 0
x = 1
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