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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)
5440/(x^2) = 10 // - 10
5440/(x^2)-10 = 0
5440*x^-2 = 10 // : 5440
x^-2 = 1/544
-2 < 0
1/(x^2) = 1/544 // * x^2
1 = 1/544*x^2 // : 1/544
544 = x^2
x^2 = 544 // ^ 1/2
abs(x) = 4*34^(1/2)
x = 4*34^(1/2) or x = -(4*34^(1/2))
x in { 4*34^(1/2), -(4*34^(1/2)) }
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