$\lim_{x\to\infty}\left(xln\frac{x+3}{x+1}\right)$
$3\left(-5\right)^2-33\left(-5\right)+90$
$45a^2-81b^2$
$\left(u^2+7\right)\left(1+x\right)$
$498+71$
$5-\left|\left(3-12-\left(5-8\right)\right)\right|$
$\int2te^{2t}dx$
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