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