$\int\frac{21}{x^2-9x+8}dx$
$20+90+51^2^2$
$\lim_{x\to\infty}\frac{2x-1}{y}$
$3x^2+30n+75$
$86-33-64+87-97+10+99-99$
$tan\:\theta=sqrt\left(6\right)$
$\frac{3ab^2-9b+6}{3b-1}$
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