$\frac{dy}{dx}=\left(u^2-2u\right).\:\left[x^2-x\right]$
$\sqrt{x^2-9^2}$
$\left(12xy^2\cdot4xy^2\right)$
$\frac{dy}{dx}-4y=-1$
$\left(\frac{x}{2}-y\right)\left(\frac{x}{2}-y\right)$
$cos32cos48$
$\sqrt{3x^2-x^3}$
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