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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*x = 1/(x^2) // - 1/(x^2)
4*x-(1/(x^2)) = 0
4*x-x^-2 = 0
4*x-x^-2 = 0
x*(4-x^-3) = 0
-1*x^-3 = -4 // : -1
x^-3 = 4
-3 < 0
1/(x^3) = 4 // * x^3
1 = 4*x^3 // : 4
1/4 = x^3
x^3 = 1/4 // ^ 1/3
x = (1/4)^(1/3)
x = 0
x = 0
x in { 0}
x = (1/4)^(1/3)
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