$\left(3x^3-2\right)\left(3x^2-7\right)$
$2a-3b^24a-5b^2$
$4x^2-81\:\ge\:0$
$\frac{dy}{2x}=ydx$
$121s^2-66st+9t^2$
$x^2x+9$
$\left(a^2+2b^2\right)^2-\left(a^2-2b^2\right)^2$
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