$\lim_{x\to3}\left(\frac{1}{3-x}\right)$
$\int\left(x^3+1\right)\sin\left(x\right)dx$
$\left(x-3\right)\left(x-6\right)$
$20-3x=x+4$
$3\left(x+1\right)\left(x-4\right)$
$\left(3a^2+5a-3\right)\left(4a^2-2a+3\right)$
$\int\sqrt{-1-4x^2-8x}dx$
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