Fuente TeX:

z + w = \cos \left(\frac{5\pi}{6} \right) + i \sin \left(\frac{5\pi}{6} \right) + \cos \left(\frac{7\pi}{6} \right) + i \sin \left(\frac{7\pi}{6} \right) = \cos \left(\frac{5\pi}{6} \right) + \cos \left(\frac{7\pi}{6} \right)