$\int x\left(x^2-81\right)^6dx$
$225x^2-30x+1$
$\lim_{x\to0}\left(\frac{2}{x}\right)$
$3^{2\:}x\:5^3$
$-2^2-8x-2+1$
$\frac{4x^2-9y^2}{2x-3y}$
$-\frac{9}{\left(3x+2\right)^2}$
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