$\left(2x^3-6x\right)^3$
$ad-3cd+ca-a+3b-3bd$
$\frac{x^2+2-4}{x^6+3}$
$2cos^2x=cos2x+1$
$\left(1-t\right)\left(t-2\right)$
$\frac{dy}{dx}=\:30x-xy$
$x2-3x+73$
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