$\sqrt{2}\cdot\sqrt{13}\cdot\sqrt{16}$
$\frac{64a^3+343}{4a+7}$
$a+5a+5a+25$
$x^2+x-13$
$2\tan^2a+\sec^2a-2=0$
$\frac{d}{dx}x^{x-6}$
$\left|-8\right|8$
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