$\left(\frac{b}{b-2}-\frac{3}{b^2-4}\right)$
$\frac{1}{n^2}+w^8-\frac{2w^4}{n}$
$5x^2-59x+90$
$\lim_{x\to-2}\left(\frac{x^3+8}{2x+2}\right)$
$e=\frac{\left(a+b\right)^{2}-\left(a-b\right)^{2}}{4ab}$
$27a^2\:+\:42a\:-\:5$
$f\left(x\right)=2x^3\left(2x^4-5x\right)$
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