$\left(x^n+y^n\right)^2$
$\lim_{x\to1}\left(\frac{x}{1-x^2}\right)$
$\frac{4x+12}{3}+\frac{x^2}{9}$
$\frac{25x^2}{16}-10xy^2+16y^4$
$\frac{5}{x-4}>2$
$8n+10$
$\frac{x^3y^5}{xy^4}$
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