$16a^2b\:+\:12ab$
$2x+6<-2$
$6-0.73$
$6k\:x\:7k$
$5y+2x-3-y+5x+10$
$\left(a\:+\:3\right)^3$
$\frac{\tan^2x}{1-\sec x}=\frac{\tan x}{\cot x+\csc x}$
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