$2+9+-18-13+-15$
$20^9\cdot16^5\cdot23^8$
$\frac{dy}{dx}3x^2\cdot y=x^2$
$3^2-234+4^2$
$\frac{x^2-36}{x^2+3x-18}$
$\lim_{x\to\infty}\left(\sqrt{x}e^{-2x}\right)$
$4x^2+56=25$
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