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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3.5 = 0.05*(0.1/x)^2 // - 0.05*(0.1/x)^2
3.5-(0.05*(0.1/x)^2) = 0
3.5-0.05*(0.1/x)^2 = 0
-0.05*0.1^2*x^-2 = -3.5 // : -0.05*0.1^2
x^-2 = 70*0.1^-2
-2 < 0
1/(x^2) = 70*0.1^-2 // * x^2
1 = 70*0.1^-2*x^2 // : 70*0.1^-2
1/7000 = x^2
x^2 = 1/7000 // ^ 1/2
abs(x) = (1/7000)^(1/2)
x = (1/7000)^(1/2) or x = -(1/7000)^(1/2)
x in { (1/7000)^(1/2), -(1/7000)^(1/2) }
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