$x\left(s\right)=\frac{3+x^2-a^2}{\left(x^2-a^2\right)\left(x^2+11\right)}$
$\left(x^2+xy+y^2\right)^2$
$\frac{2x^2+x-1}{x^2-1}$
$x^2+16x+62$
$\left|\left(1+x^2\right)-1\right|$
$35+4\cdot$
$\sqrt[8]{16}^2$
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