$\int\frac{6x-12}{x^2}dx$
$x-5<2x-5$
$\frac{16x^8-1}{2x^2+1}$
$12abc-5-12abc+8$
$x^3-3x^2+4$
$3\:sen^2x=1$
$\lim_{x\to0}\left(\frac{xe^x}{x^3}\right)$
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