$\arctan\left(2.8\right)$
$5ab+3ab-2ab$
$5^2.5^5$
$\left(2ab+a^3b\right)^3$
$3xy^2+5y-y^3$
$3a^2b^3\left(2a-3b\right)$
$\frac{dy}{dx}=\frac{1}{\left(x-1\right)\left(1-2x\right)}$
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