$-13+u=8$
$\:\frac{x^3+3x+1}{x+1}$
$2x^3-2x^2-40x$
$\frac{dy}{dx}\left(x^3y-2x^2+y^4=8\right)$
$s^2+12s+144$
$\int\frac{lnx+2}{x\sqrt{-9lnx^2+6lnx+3}}dx$
$\cot\left(180^{\circ}-2a\right)$
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