Hello I have a quick algebra question.
If I have the following expression
$\large \frac{1}{x^2+1}$, and I multiply the numerator and the denominator by $(x^2+1)$.
Is there any way I can get $x^4+x^2−1$?
The reason I am asking this is because on a problem I did this expression came up and it confused I will post the link.