$ab^2-30ab+25a^2$
$\left(a^9-6\right)\left(a^9+6\right)$
$\left(2m-4n^4\right)^3$
$20y=24\frac{dy}{dt}$
$\int\frac{\left(2x+1\right)}{x^2+4x-21}dx$
$\frac{a^2}{36}-\frac{h^2}{25}$
$z^2-z^6$
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