TeX Quellcode:

\begin{array}{rcl}z_1^3 &=& 2^3\left(\cos\left(3\cdot\dfrac{2\pi}{3}\right)+i\sin\left(3\cdot\dfrac{2\pi}{3}\right)\right) \\ &=& 8\left(\cos\left(2\pi\right)+i\sin\left(2\pi\right)\right) \\ &=& 8\left(\cos\left(0\right)+i\sin\left(0\right)\right) \\ &=& 8\end{array}