$\int\frac{x^3+x+5}{x^2+1}dx$
$\lim_{x\to0}\left(\frac{5}{x^4}-\frac{1}{x^2}\right)$
$\left(\frac{b^3}{b^4}\right)^23$
$\left(2x^3+9x^2\right)^4$
$x^2-2\frac{1}{2}x+1$
$\frac{\frac{d}{dx}sinx}{cosx}$
$\int3x^8dx$
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