$a^6-2a^3$
$\int\left(\frac{2x^3+x}{x^4+x^2+1}\right)dx$
$\frac{25-36n^4}{5-6n^2}$
$2x^3-15x^2+33x-20$
$30a^2-53+21$
$\int_{\frac{1}{\sqrt{3}}}^{\sqrt{3}}\left(\frac{5-x^2}{1+x^2}\right)dx$
$\int\left(5x^2-12x\left(e^{2x}\right)\right)dx$
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