$u^2-9u^2$
$15m^5n+3m^5n$
$17n+18-10n+19$
$\lim_{x\to\frac{2}{3}}\left(9x^2\:-4\right)$
$\int\left(\frac{x^2-8x+16}{\sqrt{x^2-8x+65}}\right)dx$
$\left(tanx+1\right)\left(\sqrt{3}tanx-1\right)=0$
$\frac{3x^3-3x^2+3x-1}{x+1}$
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