# How do you simplify (1 - 2/a)/(4/(a^2 - 1))?

$\frac{\frac{a - 2}{a}}{\frac{4}{{a}^{2} - 1}}$
=((a^2 - 1)(a - 2))/(4a
$= \frac{{a}^{3} - a - 2 {a}^{2} + 2}{4 a}$