$\pi a^2-\pi b^2$
$5x-3>0$
$\int x\left(4w-1\right)^3dw$
$\left(a-b+7\right)^2$
$\left(\frac{1}{2}m^3-5n^4\right)^3$
$3x^4-48x^2$
$\lim_{u\to0}\left(\frac{\left(x+u\right)^2-u}{u}\right)$
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