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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x^(-2/3) = 36 // - 36
x^(-2/3)-36 = 0
1*x^(-2/3) = 36 // : 1
x^(-2/3) = 36
-2/3 < 0
1/(x^(2/3)) = 36 // * x^(2/3)
1 = 36*x^(2/3) // : 36
1/36 = x^(2/3)
x^(2/3) = 1/36 // ^ 3
x^2 = 1/46656 // ^ 1/2
abs(x) = 1/216
x = 1/216 or x = -1/216
x in { 1/216, -1/216 }
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