$x2+5x+3$
$\frac{dy}{dx}\left(2x+y^2=xe^y\right)$
$x^2-4x\le0$
$x^2y-2y=0$
$\frac{cos\left(3a\right)-sin\left(3a\right)}{1-2sin\left(2a\right)}=cos\left(a\right)+sin\left(a\right)$
$cos\alpha\:=-\frac{2}{3}\:\:$
$\frac{3x-4}{5}\cdot20$
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