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{d ^{2}}{d x ^{2}} ((y^{2}) (- 3 x^{3} y^{2} - x^{2} y - 3 x - 2 y^{2}))

cos (t - 1) U (t - 1)

(a^{2} - \frac{1}{4})^{4}

\frac{( e ^{- 7 s} )}{( s - 3 ) ( s - 1 )}

(1 - i) (13 - 41 i, 7 - i)

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)