$\lim_{x\to4}\frac{4-x}{3-\sqrt{x+5}}$
$\int\frac{3x+1}{\left(x^2+2\right)\left(x-3\right)}dx$
$a^2b^4+24a^3b^5+144a^4b^6$
$\frac{-100}{5}$
$\lim_{x\to1}\left(\frac{t-1}{t^2-1}\right)$
$\int\frac{1}{n}dn$
$x\cdot2x^3+x^2+2x-3$
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