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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)
(y^3)/(x^2)-5 = 0
x^-2*y^3 = 5 // : y^3
x^-2 = 5/(y^3)
-2 < 0
1/(x^2) = 5/(y^3) // * x^2
1 = x^2*(5/(y^3)) // : 5/(y^3)
1/(5/(y^3)) = x^2
x^2 = 1/(5/(y^3)) // ^ 1/2
abs(x) = 1/((5^(1/2))/(y^(3/2)))
x = 1/((5^(1/2))/(y^(3/2))) or x = -(1/((5^(1/2))/(y^(3/2))))
x in { 1/((5^(1/2))/(y^(3/2))), -(1/((5^(1/2))/(y^(3/2)))) }
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