$\frac{d}{dx}\frac{a}{bx+c}$
$\lim_{x\to0}\left(\frac{x-2}{x^3-4x}\right)$
$\frac{x^2-2x+1}{x^3+x^2-x-1}$
$-2x^2-4x+16$
$2y^2x+2ax+2x+2x-y^2-y-1$
$2a-3b^24a-5b^2$
$\int\frac{x^5+x-1}{x^3-1}dx$
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