$\lim_{x\to\infty}\left(x-x^2\cdot\ln\left(1+x^{-1}\right)\right)$
$\frac{-3}{\sqrt{1-9x^2}}$
$\lim_{x\to\infty}\left(\frac{5-\sqrt{x^2-1}}{5-\sqrt{1+x^2}}\right)$
$-1891+74$
$-4^2\ne\left(-4\right)^2$
$-98-183$
$r\:+\:3\:-6r\:+\:4$
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