$\lim_{x\to1}\left(\frac{3x^a-3}{x^b-1}\right)$
$\left(x-6\right)\left(2x^2-6\right)$
$\left(a+b+c-x\right)\left(a+b+c+x\right)$
$y'+3x^2y=0$
$5y^2-24y+16$
$\lim_{x\to0}\left(\frac{\sin3\cdot\theta}{\tan\theta}\right)$
$\int\frac{x}{x-20}dx$
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