$a^2-2ab^2$
$\lim_{x\to0}\left(x^2-4\right)$
$\int\left(\frac{x}{x^4+6x^2+13}\right)dx$
$ax\left(bx+ay\right)+by\left(ay+bx\right)$
$\:x^4+2x^3$
$\left(-22\right)-\left(-17\right)-\left(-14\right)-\left(+8\right)$
$4\frac{14}{31}+6\frac{2}{62}$
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