$1-27a^3\:b^3$
$9a^2+10a-12$
$\frac{x-1}{x^3+x}$
$\int sen^23xcos3xdx$
$\lim_{x\to1}\left(\frac{7x^3-9x+4}{5x^3+4x^2-8}\right)$
$\frac{2x^2-10x-16}{x-6}$
$\frac{1-x}{-2\:}<2x$
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