$12-36-8+15-19-20-36+2-1$
$\lim_{x\to\infty}\left(\frac{e^x}{x^2+2x+3}\right)$
$y'=\frac{y}{x}+1$
$\frac{14}{5}=2\frac{4}{5}$
$x^210xy+xy+16y^2$
$3x^2-5x+12;\:x=-2$
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