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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x^(-1/3) = -3/2 // + -3/2
x^(-1/3)-(-3/2) = 0
x^(-1/3)+3/2 = 0
1*x^(-1/3) = -3/2 // : 1
x^(-1/3) = -3/2
-1/3 < 0
1/(x^(1/3)) = -3/2 // * x^(1/3)
1 = -3/2*x^(1/3) // : -3/2
-2/3 = x^(1/3)
x^(1/3) = -2/3 // ^ 3
x = -8/27
x = -8/27
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