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