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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^4-24^2)/(x^2) = 0
(x^4-576)/(x^2) = 0
1*x^4 = 576 // : 1
x^4 = 576
x^4 = 576 // ^ 1/4
abs(x) = 2*36^(1/4)
x = 2*36^(1/4) or x = -(2*36^(1/4))
x in { 2*36^(1/4), -(2*36^(1/4)) }
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