$\frac{x-1}{\:x^2+x-2}$
$\cot\left(0.52\right)$
$\lim_{x\to\infty}\left(\frac{5}{12x+3}\right)$
$12a^2-8a$
$2x^2-x-12\le9$
$a2\:+\:2a\:\left(a\:-\:b\right)\:+\:\left(a\:-\:b\right)2\:$
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