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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(1/3)*x^2-(1/x) = (1/6)*x^2 // - (1/6)*x^2
(1/3)*x^2-((1/6)*x^2)-(1/x) = 0
(1/3)*x^2+(-1/6)*x^2-x^-1 = 0
1/6*x^2-x^-1 = 0
x^-1*(1/6*x^3-1) = 0
1/6*x^3 = 1 // : 1/6
x^3 = 6
x^3 = 6 // ^ 1/3
x = 6^(1/3)
1/x = 0
1*x^-1 = 0 // : 1
x^-1 = 0
x należy do O
x = 6^(1/3)
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