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D( x )
x^2-1 = 0
x+1 = 0
x-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+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)
1/(x-1)-(1/(x+1)) = 2/(x^2-1) // - 2/(x^2-1)
1/(x-1)-(1/(x+1))-(2/(x^2-1)) = 0
1/(x-1)-(x+1)^-1-2*(x^2-1)^-1 = 0
1/(x-1)-1/(x+1)-2/(x^2-1) = 0
(1*(x+1)*(x^2-1))/((x-1)*(x+1)*(x^2-1))+(-1*(x-1)*(x^2-1))/((x-1)*(x+1)*(x^2-1))+(-2*(x-1)*(x+1))/((x-1)*(x+1)*(x^2-1)) = 0
1*(x+1)*(x^2-1)-1*(x-1)*(x^2-1)-2*(x-1)*(x+1) = 0
2*x^2-2*x^2-2+2 = 0
0 = 0
0/((x-1)*(x+1)*(x^2-1)) = 0
0/((x-1)*(x+1)*(x^2-1)) = 0 // * (x-1)*(x+1)*(x^2-1)
0 = 0
x belongs to the empty set
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