$1-20609$
$\left(5x+\right)^3$
$3mn^2+5m-5m^3-2mn^2-15-4m^3-3n$
$cos2x-1=0$
$\frac{d}{dx}\left(\frac{y^2}{\left(1+x^2\right)}\right)$
$\left(4a-3\right)\left(5a-2b\right)$
$lnx=-2020$
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