$\frac{1-tg^2x}{cos2x}$
$\int\frac{2x^2}{x^3+x^2+x+1}dx$
$\frac{6cr^3}{3c^4r^6}$
$\lim_{x\to\infty}\left(\frac{4^n}{3^n-1}\right)$
$\frac{x^3}{\left(x^2+12x+20\right)}$
$2f+6\ge-4$
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