$\lim_{x\to1.99}\left(\frac{x-2}{x^2-4}\right)$
$\frac{\left(x\right)^2-1^2}{x+1}$
$3\log\left(x^{11}\right)-3\log\left(x^3\right)$
$125^{27^{-\frac{1}{3}}}$
$-45x^2+20y^2$
$x^2\:\frac{dx}{dy}+y\:=0$
$\left(2x+1\right)\left(5x-1\right)$
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