$\frac{5}{x-2}+3\le4$
$8-6w+4-9w$
$\left(a+b-1\right)^2$
$\frac{cos^2\left(y\right)}{1-cos^2\left(y\right)}$
$2r\:-\:3\:+\:7\:-\:9r\:$
$\left(a^2xby^2\right)^2$
$\frac{a^3b^3}{b^3}^2$
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