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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)
1000 = 1/(x^3) // - 1/(x^3)
1000-(1/(x^3)) = 0
1000-x^-3 = 0
-1*x^-3 = -1000 // : -1
x^-3 = 1000
-3 < 0
1/(x^3) = 1000 // * x^3
1 = 1000*x^3 // : 1000
1/1000 = x^3
x^3 = 1/1000 // ^ 1/3
x = 1/10
x = 1/10
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