$\frac{\left(\sqrt{3}-\sqrt{5}\right)\left(\sqrt{3}+\sqrt{5}\right)}{2}$
$5xy+15x^2$
$\left(3u^{-3}v\right)^2$
$\left(3x+3\right)\left(3x-7\right)$
$m^2-30m-675$
$\lim_{x\to0}\left(\left(\frac{6x}{6x+1}\right)^x\right)$
$\left(7ax+1\right)\left(7ax+8\right)$
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