$\frac{w}{2}=9$
$\frac{2}{5x-x^2}$
$-7-4\left|2-2\cdot2\right|$
$\int\frac{x^2}{\sqrt{-4\cdot\left(x-1\right)^2+9}}$
$56.45\le3\:\frac{1}{5}$
$\left(-11y^4+31y^3-8y^2\right)\left(-9y+6y^2\right)$
$\frac{\left(11x-4\right)}{2}$
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