$\frac{4x^2-12x+5}{x-1}$
$\lim_{x\to\infty}20x^{\frac{1}{20}}-20$
$7x^3y+3yx$
$\left\{x^3+2y\right\}^2$
$\int_0^{\infty}\left(\frac{4x^3+5x^2+2x+3}{x^2+4}\right)dx$
$2xydx+x^2-1dy=0$
$\int\frac{x+7}{4x^2-1}dx$
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