What is expand (-x^2-1)/((x^2-1)^2) ?

The solution to expand (-x^2-1)/((x^2-1)^2) is (-x^2-1)/(x^4-2x^2+1)

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expand (-x^2-1)/((x^2-1)^2)

expand

\frac{- x ^{2} - 1}{( x ^{2} - 1 ) ^{2}}

\frac{- x ^{2} - 1}{x ^{4} - 2 x ^{2} + 1}

Solution steps

\frac{- x ^{2} - 1}{( x ^{2} - 1 ) ^{2}}

(x^{2} - 1)^{2} = x^{4} - 2 x^{2} + 1

= \frac{- x ^{2} - 1}{x ^{4} - 2 x ^{2} + 1}

\frac{s ^{2} + 6 s + 9}{( s - 1 ) ( s - 2 ) ( s + 4 )}

(x + 23) (x - 23)

(1 + 5 x i)^{2}

\frac{x ^{2}}{( 1 - x ) ( 1 + x ^{2} ) ^{2}}

What is expand (-x^2-1)/((x^2-1)^2) ?
The solution to expand (-x^2-1)/((x^2-1)^2) is (-x^2-1)/(x^4-2x^2+1)