$\lim_{x\to\infty}\left(-2\left(x-1\right)^2\right)$
$b x^2-b$
$\int\frac{r^2}{\left(r+4\right)}dr$
$\left(4x+3y+2\right)\left(x+5y\right)$
$\left(y-50\right)^2$
$x\left(x+2\right)-17=1+5x$
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