$-2x^3+x^2-3x-6$
$\int\left(\frac{4x^5}{5\sqrt{x^2+4}}\right)dx$
$984+-685$
$y'+4y=cosx$
$\left(-\frac{1}{9}y-1\right)\left(-\frac{1}{9}y+1\right)$
$\frac{d^2}{dx^2}\left(1-\frac{3}{x}\right)$
$-x^2-2x-3>0$
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