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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(x^-2)/3 = 5/6 // - 5/6
(x^-2)/3-(5/6) = 0
(x^-2)/3-5/6 = 0
1/3*x^-2 = 5/6 // : 1/3
x^-2 = 5/2
-2 < 0
1/(x^2) = 5/2 // * x^2
1 = 5/2*x^2 // : 5/2
2/5 = x^2
x^2 = 2/5 // ^ 1/2
abs(x) = (2/5)^(1/2)
x = (2/5)^(1/2) or x = -(2/5)^(1/2)
x in { (2/5)^(1/2), -(2/5)^(1/2) }
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