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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)
1-(250000/(x^2)) = 0
1-250000*x^-2 = 0
-250000*x^-2 = -1 // : -250000
x^-2 = 1/250000
-2 < 0
1/(x^2) = 1/250000 // * x^2
1 = 1/250000*x^2 // : 1/250000
250000 = x^2
x^2 = 250000 // ^ 1/2
abs(x) = 500
x = 500 or x = -500
x in { 500, -500 }
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