$\lim_{x\to\infty}\frac{x^3+x^2+x+1}{x^3+3x^2+5x+2}$
$\lim_{x\to0}\left(\frac{3}{1+2e^x}\right)$
$\int\frac{\frac{1}{8}x+\frac{3}{4}}{x^2+4}dx$
$x^4+x^3+x^2+x$
$\left(-59\right)-\left(-18\right)$
$2x^2-2x+50$
$\frac{4x^6-3x^4+x^2+5}{x-1}$
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