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D( x )
1-x = 0
1-x = 0
1-x = 0
1-x = 0 // - 1
-x = -1 // * -1
x = 1
x in (-oo:1) U (1:+oo)
0.00012 = (((2*x)^2)/(1-x))*(1-x) // - (((2*x)^2)/(1-x))*(1-x)
0.00012-((((2*x)^2)/(1-x))*(1-x)) = 0
0.00012-(2*x)^2 = 0
-4*x^2 = -0.00012 // : -4
x^2 = 0.00003
x^2 = 0.00003 // ^ 1/2
abs(x) = 0.00003^(1/2)
x = 0.00003^(1/2) or x = -0.00003^(1/2)
x in { 0.00003^(1/2), -0.00003^(1/2) }
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