$49\cdot\left(28-1\right)$
$l=1+\frac{1}{1+l}$
$m^2-2m+m^2$
$7=\frac{v}{9}$
$3x^3\:y^3\:+15x^2\:y-24x^2y^4$
$\lim_{x\to\infty}\left(\frac{2x+3}{2x+1}\right)^{x+1}$
$\left(4n+3\right)\left(4n-3\right)$
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