$16a^4b^5-20a^3b^2-24a^2b^6$
$x'=3x$
$ac+bc+ad+bd$
$-145-500$
$2a^3-8a^2b^2$
$\left(x-7a\right)\left(2x-9a\right)$
$\sin\left(\tan^{-1}\frac{x}{6}\right)$
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