$\left(r^4-4r^3+7\right)\left(-3r^4-5r^3\right)$
$13x^3+8x$
$\frac{8x^{4}+38x^{3}+13x^{2}-33x-20}{x+11}$
$4x^2-24x+100=0$
$-x^3+2x^2+5x-6$
$-16x-4$
$\int x\frac{x}{\sqrt{\left(3-2x-x^2\right)}}dx$
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