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