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}

- 12 a - 5 (\frac{213}{19} = - 27)

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

sin (x) (4 cos^{2} (x) + 2 cos (x) - 1)

\frac{d}{d y} ((x) ((1 + 6 x)^{4}))

x^{2} (- a sin (x) + b cos (x))

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)