$\lim_{x\to-1}\left(3x+\frac{1}{x}\right)$
$\cos\:\left(y\right)\cos\:\left(x-y\right)$
$-13-4+12-2+4+1$
$5\left(5\right)^3-7\left(5\right)^2\left(4\right)+4^3$
$\frac{729}{64}m^3x^{15}-8n^6$
$5-\left(7-2-3\left(3-9\right)\right)-3+4+12$
$\left(\:x\:+\:10\right)\left(x\:-\:7\right)$
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