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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)
-4600 = -2268/(x^2) // + -2268/(x^2)
-(-2268/(x^2))-4600 = 0
2268*x^-2-4600 = 0
2268*x^-2 = 4600 // : 2268
x^-2 = 1150/567
-2 < 0
1/(x^2) = 1150/567 // * x^2
1 = 1150/567*x^2 // : 1150/567
567/1150 = x^2
x^2 = 567/1150 // ^ 1/2
abs(x) = (567/1150)^(1/2)
x = (567/1150)^(1/2) or x = -(567/1150)^(1/2)
x in { (567/1150)^(1/2), -(567/1150)^(1/2) }
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