$\frac{a^6b^9-5a}{a^2b^3-6c^4}$
$\frac{x^2-3x}{x^2-9}$
$\frac{\cos x}{\cot x}+\tan x\cos x=2\sin x$
$\frac{16}{2\sqrt{8}}$
$15x^2-x-2$
$\left(3x+2\right)\left(6x-3\right)$
$16+40x^2+25^4$
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