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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/16 = x^-2 // - x^-2
1/16-x^-2 = 0
-1*x^-2 = -1/16 // : -1
x^-2 = 1/16
-2 < 0
1/(x^2) = 1/16 // * x^2
1 = 1/16*x^2 // : 1/16
16 = x^2
x^2 = 16 // ^ 1/2
abs(x) = 4
x = 4 or x = -4
x in { 4, -4 }
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