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D( x )
x^2 = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
(2*x-(1/(x^2)))^9 = 0
(2*x-x^-2)^9 = 0
2*x-x^-2 = 0
x*(2-x^-3) = 0
-1*x^-3 = -2 // : -1
x^-3 = 2
-3 < 0
1/(x^3) = 2 // * x^3
1 = 2*x^3 // : 2
1/2 = x^3
x^3 = 1/2 // ^ 1/3
x = (1/2)^(1/3)
x*(x-(1/2)^(1/3)) = 0
x^9*(x-(1/2)^(1/3))^9 = 0
( x-(1/2)^(1/3) )
x-(1/2)^(1/3) = 0 // + (1/2)^(1/3)
x = (1/2)^(1/3)
( x )
x = 0
x in { 0}
x in { (1/2)^(1/3), (1/2)^(1/3), (1/2)^(1/3), (1/2)^(1/3), (1/2)^(1/3), (1/2)^(1/3), (1/2)^(1/3), (1/2)^(1/3), (1/2)^(1/3) }
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