$\int\frac{3x^2-x+1}{\left(x^2+1\right)\left(x-1\right)}dx$
$7m+6m^2$
$\int\frac{3x-1}{\left(x^2+4\right)\left(x-4\right)}dx$
$\frac{1-n^4}{1+n^4}$
$\left(8n+7m\right)^2$
$20^0$
$\lim_{x\to\infty}\frac{e^{x^4}}{5-x^5}$
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