$\frac{81x^5}{9x^5}$
$\frac{m^2-2m-8}{4m-1}$
$\left(1-2y^2-3y^3\right)^3$
$-15-2\cdot9$
$\lim_{x\to-2}\left(\frac{x^4-a}{x^2-2x-8}\right)$
$-\frac{30}{2}$
$\pi\int_1^31dx$
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