TeX Quellcode:
{ \dfrac{4}{2+\sqrt{2}i} \; = \; \dfrac{4(2-\sqrt{2}i)}{(2+\sqrt{2}i)(2-\sqrt{2}i)} \; = \; \dfrac{8-4\sqrt{2}i}{2^2-(\sqrt{2}i)^2} \; = \; \dfrac{2(4-2\sqrt{2}i)}{6} \; = \; \dfrac{4} {3} - \dfrac{2\sqrt{2}}{3}i}