$$\frac { 1 - b ^ { - 1 } + b ^ { - 2 } } { 1 - b + b ^ { 2 } }$$
$\frac{1}{b^{2}}$
$$\frac{b^{-2}\left(b^{2}-b+1\right)}{b^{2}-b+1}$$
$$b^{-2}$$
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