$9m^2-24m-16$
$\lim_{x\to-2}\left(\frac{x^2-9}{x^2-3}\right)$
$\frac{1}{3^{n+1}}$
$12x+4y$
$4x^2-8x-12$
$cos\left(x\:+\:\frac{\pi}{2}\right)$
$\frac{x^4-2x^3+8x-15}{x+1}$
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