$89\cdot66$
$\frac{d}{dx}\left(\frac{\sqrt{x^2-81}}{\sqrt{x^2+81}}\right)$
$19\cdot10^7$
$3x+4y=5x-4y$
$\int\left(\left(x^4+x^3\right)^6\left(4x^3+3x^2\right)\right)dx$
$-1+3\left(4+6m\right)$
$-a^2-12a-108$
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