$\left(\frac{b^{-1}}{a^{-1}}\right)^{a+b}$
$\left(3ab+4b\right)\left(3ab-4b\right)$
$4\:-\:6cos^2x$
$\left(\frac{m}{3}-8n\right)^2$
$12x^2m+36y^4m-4x^2n-12y^4n$
$\frac{x^3-3x+9}{3}$
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