(x^2 -1/x^2-x+1/x +2x-2/x-2)
x^2 -1/x^2+ x - 1/x -2
Listo
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(x^2 -1/x^2-x+1/x +2x-2/x-2)
x^2 -1/x^2+ x - 1/x -2
Listo
.........................................................