$\left(xy^2-5z\right)^2$
$-7x+43\le2x-2$
$0,505-0,5$
$35\cdot18$
$-\left(7\cdot\:+11\right)^2$
$\sqrt{xy}\sqrt{x}^3y$
$x\frac{dy}{dx}=\frac{x}{\cos\left(\frac{y}{x}\right)}+y$
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