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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 = 9/(x^2) // - 9/(x^2)
1-(9/(x^2)) = 0
1-9*x^-2 = 0
-9*x^-2 = -1 // : -9
x^-2 = 1/9
-2 < 0
1/(x^2) = 1/9 // * x^2
1 = 1/9*x^2 // : 1/9
9 = x^2
x^2 = 9 // ^ 1/2
abs(x) = 3
x = 3 or x = -3
x in { 3, -3 }
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