$\sec x-\tan x\cdot\csc x+1=\cot x$
$x+7<8$
$3a^2+8a+4$
$1\:+\:\frac{x\:+\:y}{x-y}$
$5b\:.\:5a\:.\:5ab$
$\int\frac{9x}{\sqrt{9x^2-4}}dx$
$64m^2-208m+169$
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