$20\cdot8$
$x^2\:\frac{dy}{dx}+xy-1=0$
$\int3x^2sin\left(x\right)\:dx$
$\left(a^3-3b\right)^5$
$tana-seca$
$\lim_{x\to\infty}\left(\frac{\left(x^2+3x+7\right)}{x^3+7x^2+19}\right)$
$3m-6+m^2-5m+1$
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