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