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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)
4*y-(1/(x^2)) = 0
4*y-x^-2 = 0
-1*x^-2 = -(4*y) // : -1
x^-2 = 4*y
-2 < 0
1/(x^2) = 4*y // * x^2
1 = 4*x^2*y // : 4*y
1/(4*y) = x^2
x^2 = 1/(4*y) // ^ 1/2
abs(x) = 1/(2*y^(1/2))
x = 1/(2*y^(1/2)) or x = -(1/(2*y^(1/2)))
x in { 1/(2*y^(1/2)), -(1/(2*y^(1/2))) }
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