$\lim_{x\to infinity}\left(xe^{-x^2}\right)$
$\frac{2x+4}{9x^2-25}$
$\frac{2}{2\sqrt{2x}}+\frac{3}{3\sqrt[3]{3x^2}}$
$\left(-225\right)-\left(50\right)$
$-0.1a^2+0.5ab+10ab^2$
$\left(w-2x-y+3z\right)^2$
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