$x^2-4x+13=0\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:$
$4x^2-10x-3$
$\frac{15a^3b^2}{5ab^4}$
$2x^2-x-18<0$
$cos2x=1-2sinx$
$2x^2-3xy$
$\frac{2x-y}{4\sqrt{2x}+\sqrt{y}}$
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