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