TeX Quellcode:

\begin{array}{rcl}\varphi &=& \pi+\arctan\left(\dfrac{-1}{-1}\right) \\\varphi &=& \pi+\arctan{\left(1\right)} \\\varphi &=& \pi+\dfrac{\pi}{4} \\\\\varphi &=& \dfrac{5\pi}{4}\end{array}