$\left(x-7\right)\left(x-9\right)$
$\lim_{x\to044}\left(\frac{1-\cos\left(x\right)}{x^2}\right)$
$3+4+3+4-8-5+10$
$\left(-\:3\right).\:\left(-\:5\right)$
$3a^2-2a+7$
$\frac{p^{18}-\:81}{p^9+\:9}$
$x^65x^5$
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