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D( x )
x = 0
x^2 = 0
x = 0
x = 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-((16/3)*x)+(4/x)/(x^2) = 0
x+(-16/3)*x+(4/x)/(x^2) = 0
4*x^-3-13/3*x = 0
x*(4*x^-4-13/3) = 0
4*x^-4 = 13/3 // : 4
x^-4 = 13/12
-4 < 0
1/(x^4) = 13/12 // * x^4
1 = 13/12*x^4 // : 13/12
12/13 = x^4
x^4 = 12/13 // ^ 1/4
abs(x) = (12/13)^(1/4)
x = (12/13)^(1/4) or x = -(12/13)^(1/4)
x = 0
x = 0
x in { 0}
x in { (12/13)^(1/4), -(12/13)^(1/4) }
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