Выполните действие: \[\frac{a-5}{a^2-1}-\frac{4}{1-a^2}.\] \(\dfrac{1}{a+1}\) \(\dfrac{-1}{1+a}\) \(\dfrac{a-9}{1-a^2}\) \(\dfrac{a-9}{(a^2-1)(1-a^2)}\) \(\dfrac{a-1}{a+1}\)

Задание

Выполните действие:

\[\frac{a-5}{a^2-1}-\frac{4}{1-a^2}.\]

\(\dfrac{1}{a+1}\)
\(\dfrac{-1}{1+a}\)
\(\dfrac{a-9}{1-a^2}\)
\(\dfrac{a-9}{(a^2-1)(1-a^2)}\)
\(\dfrac{a-1}{a+1}\)