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