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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)
4*X-(48/(x^2)) = 0
4*X-48*x^-2 = 0
-48*x^-2 = -(4*X) // : -48
x^-2 = X/12
-2 < 0
1/(x^2) = X/12 // * x^2
1 = (X/12)*x^2 // : X/12
12*X^-1 = x^2
x^2 = 12*X^-1 // ^ 1/2
abs(x) = 2*3^(1/2)*X^(-1/2)
x = 2*3^(1/2)*X^(-1/2) or x = -(2*3^(1/2)*X^(-1/2))
x in { 2*3^(1/2)*X^(-1/2), -(2*3^(1/2)*X^(-1/2)) }
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