$\lim_{x\to\infty}\left(\frac{2x^2-7x+3}{x^3+3x^2-x+3}\right)$
$\frac{x^2-4}{x+4}$
$\int_1^5\left(\frac{x}{\sqrt{x-3}}\right)dx$
$\frac{3x^3+7x^2+3x-1}{x+1}$
$sen\:^2\:2x+3.cos^22x$
$m ^ { 4 } - 17 m ^ { 2 } + 6 m$
$n^2-144$
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