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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(9*x^5-x^2)/x = 0
9*x^5-x^2 = 0
x^2*(9*x^3-1) = 0
9*x^3 = 1 // : 9
x^3 = 1/9
x^3 = 1/9 // ^ 1/3
x = (1/9)^(1/3)
x^2*(x-(1/9)^(1/3)) = 0
(x^2*(x-(1/9)^(1/3)))/x = 0
( x-(1/9)^(1/3) )
x-(1/9)^(1/3) = 0 // + (1/9)^(1/3)
x = (1/9)^(1/3)
( x^2 )
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in { 0}
x = (1/9)^(1/3)
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