$\frac{2}{3}xcm^2+\frac{2}{3}xcm^2+\frac{2}{3}xcm^2+2xcm^2$
$\frac{6x^5+4x^4-6x^3+12x^2-8}{6x+4}$
$\frac{\left(-x^3\right)^2}{\left(-x\right)}$
$\frac{3a^4b^{-2}}{2a^{-1}b^2}$
$9w^2+9w-4$
$\frac{2p^4}{9r^7}\left(-3\right)$
$\frac{sen\left(\frac{\pi}{2}\:-x\right)}{sen\left(2x\right)}$
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