$\lim_{x\to\infty}\left(\frac{\sqrt{9x^3+11x^2-7x+6}}{8x^2+5x+3}\right)$
$\int\frac{3x^2+2x+3}{x^4+x^3+x^2+x}dx$
$\frac{x^3+1}{x+1}>0$
$2mn-6m-nm+5m+m+3mn$
$\frac{4r^4}{\left(4r\right)^3}$
$-\left(-231\right)+68$
$\lim_{x\to0}\left(\frac{x^2+x+1}{x}\right)$
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