$81b^2-36a^2$
$\lim_{x\to1}\left(\frac{\left(x^2-1\right)}{x^2-3x+2}\right)$
$-\left(a-2b\right)-\left(a+2b\right)-\left(-a-3b\right)$
$-2x+5+-16x+5$
$\frac{2ab}{3a\:}$
$\left(13a^3-2b\right)\left(13a^3-8b\right)$
$\left(3x^4+2\right)\left(2x^5-\sqrt{5}x\right)$
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