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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)
x-(256/(x^2)) = 0
x-256*x^-2 = 0
x-256*x^-2 = 0
x*(1-256*x^-3) = 0
-256*x^-3 = -1 // : -256
x^-3 = 1/256
-3 < 0
1/(x^3) = 1/256 // * x^3
1 = 1/256*x^3 // : 1/256
256 = x^3
x^3 = 256 // ^ 1/3
x = 4*4^(1/3)
x = 0
x = 0
x in { 0}
x = 4*4^(1/3)
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