$\frac{2x}{x^2+5x+6}$
$\lim_{x\to7}\left(x^2-14x+49\right)$
$6^16^8$
$tan37=\frac{y}{7}$
$\int4\sec^4x\:dx$
$-8\::\:-8$
$\int\frac{12}{9x^2+4}dx$
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