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D( x )
x <= 0
x^6 = 0
x <= 0
x^6 = 0
x^6 = 0
1*x^6 = 0 // : 1
x^6 = 0
x = 0
x in (0:+oo)
(8*ln(x))/(x^6) = 0
(8*ln(x))/(x^6) = 0 // * x^6
8*ln(x) = 0
8*ln(x) = 0 // : 8
ln(x) = 0
ln(x) = ln(e^0)
x = e^0
x = 1
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