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