$\frac{2x^2+3}{x^2+1}$
$x^2-5x\:<6$
$\frac{dv}{dt}+v=9.8$
$4k^2-\frac{3k^4}{7k^2}$
$y\frac{dy}{dx}=cosx-ycosx$
$\left(8xyz\right)\left(-0.2x^2yz^4\right)$
$\:\left(3x^2+5\right)^3$
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