$\frac{a^{-15}}{a^5}$
$8x^2+3x+2$
$\left(5a+8b\right)\left(8b-5a\right)$
$\lim_{x\to8}\left(\frac{x-8}{\sqrt{x}-\sqrt{8}}\right)$
$tan\left(x\right)=3.6$
$16+18-2\left(3+1\right)^2$
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