TeX Quellcode:

{ \dfrac{45} {2}\left(\cos\left(\dfrac{3\pi}{5} \right)+i \sin\left(\dfrac{3\pi}{5} \right) \right) \; : \; \left(9\left(\cos\left(\dfrac{4\pi}{9}\right)+i \sin\left(\dfrac{4\pi} {9} \right)\right)\right) \; = \; \dfrac{45}{2} \cdot \, \dfrac{1}{9} \left(\cos\left(\dfrac{3\pi}{5}-\dfrac{4\pi}{9} \right)+i \sin\left(\dfrac{3\pi}{5}-\dfrac{4\pi}{9} \right) \right) \; = \; \dfrac{5}{2} \left(\cos\left(\dfrac{7\pi}{45}\right)+i \sin\left(\dfrac{7\pi} {45} \right)\right)}