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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)
1-(64/(x^2)) = 0
1-64*x^-2 = 0
-64*x^-2 = -1 // : -64
x^-2 = 1/64
-2 < 0
1/(x^2) = 1/64 // * x^2
1 = 1/64*x^2 // : 1/64
64 = x^2
x^2 = 64 // ^ 1/2
abs(x) = 8
x = 8 or x = -8
x in { 8, -8 }
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