$\lim_{x\to-\infty}\left(\frac{4-3x^2}{2x^3+3x-1}\right)$
$y'+y=e^{3x}$
$x^2+57x+56$
$xy+4y=x^3-x$
$\int\frac{x+1}{\left(x^2+2x+2\right)^3}dx$
$\int_0^{16}\pi\left(\sqrt{y}-1\right)^2dx$
$9n^2-24n$
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