$\int\frac{1}{x^4+5x^3}dx$
$31.43270856+90$
$\lim_{x\to1}\left(\frac{sin\left(1-x^2\right)}{x-1}\right)$
$a^3b-a^2b^2+ab^3-b^5$
$2r^2+r-4=0$
$-350+-35$
$\frac{42}{6}$
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