$\lim_{x\to1}\left(\frac{x}{1-x^2}\right)$
$16z^5-12^4+4y^2$
$e^x\frac{dy}{dx}+xy^2=0$
$\int\left(\frac{-4x}{x^2+4}\right)dx$
$\left(a+b\right)^3y\:\left(a-b\right)^3$
$-7n^3.\:-7n$
$\left(\frac{1}{2}x+\frac{2}{3}y\right)\left(\frac{1}{2}x-\frac{2}{3}\right)$
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