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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)
2*x-(3200/(x^2)) = 0
2*x-3200*x^-2 = 0
2*x-3200*x^-2 = 0
2*x*(1-1600*x^-3) = 0
-1600*x^-3 = -1 // : -1600
x^-3 = 1/1600
-3 < 0
1/(x^3) = 1/1600 // * x^3
1 = 1/1600*x^3 // : 1/1600
1600 = x^3
x^3 = 1600 // ^ 1/3
x = 4*25^(1/3)
2*x = 0
2*x = 0 // : 2
x = 0
x in { 0}
x = 4*25^(1/3)
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