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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)
6-(200/(x^2)) = 0
6-200*x^-2 = 0
-200*x^-2 = -6 // : -200
x^-2 = 3/100
-2 < 0
1/(x^2) = 3/100 // * x^2
1 = 3/100*x^2 // : 3/100
100/3 = x^2
x^2 = 100/3 // ^ 1/2
abs(x) = (100/3)^(1/2)
x = (100/3)^(1/2) or x = -(100/3)^(1/2)
x in { (100/3)^(1/2), -(100/3)^(1/2) }
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