$\frac{sinx+siny}{cosx+cosy}+\frac{cosx-cosy}{sinx-siny}$
$\left(\frac{3}{2}a^3\right)\left(-\frac{4}{5}a^4\right)$
$\frac{x^{-4}}{x^8.x^{-1}}$
$\left(-\frac{3}{2}m^2\right)\cdot\left(-\frac{y}{14}a^2m^3\right)$
$9g^2-6g+4$
$\left(625^4x\:2^4\right)\::\:25^4$
$y^6\sqrt[3]{y}$
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