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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)
36/(x^2)-1 = 0
36*x^-2 = 1 // : 36
x^-2 = 1/36
-2 < 0
1/(x^2) = 1/36 // * x^2
1 = 1/36*x^2 // : 1/36
36 = x^2
x^2 = 36 // ^ 1/2
abs(x) = 6
x = 6 or x = -6
x in { 6, -6 }
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