$x2\:-\:3x\:+\:4,\:cuando\:x\:=-1$
$\frac{dy}{dx}=\frac{xy}{x^2+11}$
$\lim_{x\to0}\left(\frac{\sin x\sin2x}{1-\cos x}\right)$
$\frac{x+8}{\left(x-8\right)\left(x+8\right)}$
$3y-y-5y$
$12m+4b^2$
$6xy-4ax$
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