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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4*x^(-1/3) = 27 // - 27
4*x^(-1/3)-27 = 0
4*x^(-1/3) = 27 // : 4
x^(-1/3) = 27/4
-1/3 < 0
1/(x^(1/3)) = 27/4 // * x^(1/3)
1 = 27/4*x^(1/3) // : 27/4
4/27 = x^(1/3)
x^(1/3) = 4/27 // ^ 3
x = 64/19683
x = 64/19683
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