$y^2\:+\:11y\:-\:6y\:+\:y^2$
$y^3sen2xdx-3y^2cos^2xdy=0$
$-48-14+22-16+8$
$\lim_{x\to2}\left(\frac{x^2-3x+2}{x^2+x-1}\right)$
$857\cdot63$
$-\frac{\left(x+9\right)}{\left(x-13\right)}$
$a^2-196b^2$
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