$\lim_{x\to3}\left(12x\cos x\right)$
$\lim_{x\to-3}\left(\frac{x^2}{\left(x+3\right)^3}\right)$
$\left(m-6\right)\left(m-9\right)$
$x-1+\frac{2}{x+1}$
$\frac{5}{6x}-\frac{3}{8x}$
$-45x^2+20y^2$
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