$\lim_{x\to13}\left(-\frac{ln\:\left(x-12\right)}{x-13}\right)$
$\left(a^m-b^n\right)\cdot\left(a^m+b^n\right)$
$\left(2b-3\right)\left(b+7\right)$
$\int7\:\sec5x\:dx$
$\int\left(\frac{cosx}{\sqrt{1+sinx}}\right)dx$
$0.50\cdot0.10^{19}$
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