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D( x )
x+1 = 0
x-1 = 0
x+1 = 0
x+1 = 0
x+1 = 0 // - 1
x = -1
x-1 = 0
x-1 = 0
x-1 = 0 // + 1
x = 1
x in (-oo:-1) U (-1:1) U (1:+oo)
((x^2)/(x+1))/(x-1) = -2 // + 2
((x^2)/(x+1))/(x-1)+2 = 0
(x^2)/((x+1)*(x-1))+2 = 0
(x^2)/((x+1)*(x-1))+(2*(x+1)*(x-1))/((x+1)*(x-1)) = 0
2*(x+1)*(x-1)+x^2 = 0
3*x^2-2 = 0
(3*x^2-2)/((x+1)*(x-1)) = 0
(3*x^2-2)/((x+1)*(x-1)) = 0 // * (x+1)*(x-1)
3*x^2-2 = 0
3*x^2 = 2 // : 3
x^2 = 2/3
x^2 = 2/3 // ^ 1/2
abs(x) = (2/3)^(1/2)
x = (2/3)^(1/2) or x = -(2/3)^(1/2)
x in { (2/3)^(1/2), -(2/3)^(1/2) }
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