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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
y = (10*x^-2)/3 // - (10*x^-2)/3
y-((10*x^-2)/3) = 0
(-10/3)*x^-2+y = 0
-10/3*x^-2 = -y // : -10/3
x^-2 = 3/10*y
-2 < 0
1/(x^2) = 3/10*y // * x^2
1 = 3/10*x^2*y // : 3/10*y
10/3*y^-1 = x^2
x^2 = 10/3*y^-1 // ^ 1/2
abs(x) = (10/3)^(1/2)*y^(-1/2)
x = (10/3)^(1/2)*y^(-1/2) or x = -((10/3)^(1/2)*y^(-1/2))
x in { (10/3)^(1/2)*y^(-1/2), -((10/3)^(1/2)*y^(-1/2)) }
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