$\frac{1}{\left(1-z^{-1}\right)\left(1-2z^{-1}\right)}$
$90x^2+264x+126\:$
$3\:x\:c\:x\:d$
$w^23w+2$
$12x^2+23x+5$
$\lim_{x\to0}\left(\frac{\tan\left(x\right)-x}{x^2}\right)$
$169b^{\left(4\right)}+200b^{\left(2\right)}+144+16ab-16ab$
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