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D( x )
x <= 0
x^2 = 0
x <= 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (0:+oo)
(9*ln(x))/(x^2) = 0
(9*ln(x))/(x^2) = 0 // * x^2
9*ln(x) = 0
9*ln(x) = 0 // : 9
ln(x) = 0
ln(x) = ln(e^0)
x = e^0
x = 1
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