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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-((2/(x^2))*y) = 0
2*x-2*x^-2*y = 0
2*x-2*x^-2*y = 0
2*x*(1-(x^-3*y)) = 0
x^-3*(-y) = -1 // : -y
x^-3 = 1/y
-3 < 0
1/(x^3) = 1/y // * x^3
1 = x^3*(1/y) // : 1/y
y = x^3
x^3 = y // ^ 1/3
x = y^(1/3)
2*x = 0
2*x = 0 // : 2
x = 0
x in { 0}
x = y^(1/3)
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