$\frac{-x^2y^2}{2y}$
$2^{-2}\cdot2^5$
$\frac{dy}{dx}-\frac{y}{x}=\frac{x}{5-4cosx}$
$-43\cdot\left(-18\right)$
$18\cdot888$
$x^2+2\cdot5$
$\:4x^4+14x^3+13x^2+x-2$
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