$\left(5m^3\:+\:3n^4\right)\:\left(5m^3\:-\:3n^4\right)$
$\cos\left(a\right)=\cos\left(a\right)\sin\left(a\right)$
$\left(2x+7\right)\left(2x-5\:\right)$
$25a^2-30a+9$
$64x^2-96x+37$
$\lim_{x\to-3}\left(\frac{x^2-9}{x^2-3x-19}\right)$
$3w+4+3w+4+4w$
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