$19.57\sqrt{10}$
$\left(\:x+2y\right)\:\left(2y-x\right)$
$49u^4-225z^2$
$\frac{d}{dx}2xy+3=0$
$\int\frac{2x}{\sqrt{2x^2-400}}dx$
$-\left(2\right)^3+3\left(2\right)^2+7\left(2\right)$
$400\:.\:-8$
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