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D( x )
9*x^3 < 0
81*x^2 < 0
9*x^3 < 0
9*x^3 < 0
9*x^3 < 0
9*x^3 < 0 // : 9
x^3 < 0/9
x^3 < 0
x^3 < 0 // ^ 1/3
x < 0
x in (-oo:0)
81*x^2 < 0
81*x^2 < 0
81*x^2 < 0
81*x^2 < 0 // : 81
x^2 < 0/81
x^2 < 0
x belongs to the empty set
x in <0:+oo)
(81*x^2)^(1/4)*(9*x^3)^(1/2) = 0
9*x^2 = 0 // : 9
x^2 = 0
x = 0
x = 0
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