Example

3(r+2s)=2t-4
a⋅(b-2)=3b
3(r+2s)=2t-4
a⋅(b-2)=3b

Question

$$\frac { 1 } { x ^ { 2 } - 1 }$$

Factor

$\frac{1}{\left(x-1\right)\left(x+1\right)}$

Evaluate

$\frac{1}{x^{2}-1}$

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