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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)^2-576)/(x^2) = 0
(x^2-576)/(x^2) = 0
1*x^2 = 576 // : 1
x^2 = 576
x^2 = 576 // ^ 1/2
abs(x) = 24
x = 24 or x = -24
x in { 24, -24 }
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