$x^2-10x+19=0$
$x^3y'+2x^2y-6=0$
$\left(3^7\right)^3$
$40x+56$
$\lim_{x\to\infty}\left(4\arctan\left(e^x\right)\right)$
$\left(2a\right)^3-\left(8b\right)^3$
$\frac{m+n}{mn-n^2}.\frac{n^2}{m^2-n^2}$
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