$3x^2-25x-18$
$a^2+2x+1=0$
$2^4+-1-4^2$
$x-2\left(x^4-2x^3+5x\:-1\right)$
$\int\frac{1}{x\left(x+3\right)\left(x^2-3x+9\right)}dx$
$\sqrt{\frac{r}{r^2+4}}$
$\frac{x^2+3x-3}{x+2}$
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