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Factor polynomial 1/1-x^2

An expression to simplify:

The solution

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     2
1 - x 
$$1 - x^{2}$$
1 - x^2
Factorization [src]
(x + 1)*(x - 1)
$$\left(x - 1\right) \left(x + 1\right)$$
(x + 1)*(x - 1)
Numerical answer [src]
1.0 - x^2
1.0 - x^2
Combinatorics [src]
-(1 + x)*(-1 + x)
$$- \left(x - 1\right) \left(x + 1\right)$$
-(1 + x)*(-1 + x)