$\frac{x^2}{x}senxdx+y\frac{x}{x}dy=0$
$10a^2-5a-15a^3$
$\lim_{x\to0}\left(\frac{x^2-9}{x\:-\:3}\right)$
$w^2-12w+4$
$-2=\frac{2\tan\left(x\right)}{1-\tan\left(x\right)^2}$
$12x^2-4x$
$-3x+2;x=3$
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