$0+\left(-47\right)+\left(-286\right)$
$\frac{dw}{dt}=w^2-16$
$4y^2-11y+6$
$24a^2+48ab$
$\frac{\sqrt{x+\sqrt{r}}}{\sqrt{x}}$
$144u^2-204u+42$
$x ^ { 2 } + 6 x y + 9 y ^ { 2 } = ( x + 3 y ) ^ { 2 }$
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