$8\:\ln x-\frac{1}{9}\ln y$
$\left(a^{2}+64\right)\left(a^{2}-74\right)$
$-3x^2\le0$
$\int\frac{x}{\sqrt{x^2-49}}dx$
$-2^7$
$\frac { 8 } { 1 x ^ { 3 } - 4 x ^ { 4 } }$
$\lim_{x\to2}\left(\frac{3x^2-3x-2}{x-2}\right)$
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