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