What is expand (1-t^2)/((1+t^2)^2) ?

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

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expand (1-t^2)/((1+t^2)^2)

expand

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

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

Solution steps

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

(1 + t^{2})^{2} = 1 + 2 t^{2} + t^{4}

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

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