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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/6 = x^(-1/3) // - x^(-1/3)
1/6-x^(-1/3) = 0
-1*x^(-1/3) = -1/6 // : -1
x^(-1/3) = 1/6
-1/3 < 0
1/(x^(1/3)) = 1/6 // * x^(1/3)
1 = 1/6*x^(1/3) // : 1/6
6 = x^(1/3)
x^(1/3) = 6 // ^ 3
x = 216
x = 216
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