$\frac{2e^xe^y}{\left(e^x+e^y\right)^2}$
$x^4-4xy=3$
$x+1=7$
$-\frac{9}{9}$
$n^2-3n-60$
$2\sqrt[3]{3}xz^3\sqrt[3]{x^2}$
$\int\frac{x+2}{1-x^2}dx$
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