e. But this is correct only when 
                $x \neq 0,$ so the
                quotient is defined and the angle lies between $-\pi/2$ and $\pi/2.$ We need to extend this
                definition to cases
                where $x$ is not positive, considering the principal value of the argument separately on the four
                quadrants.</p>


            <p>The function $\textbf{Arg}(z)$ $:\mathbb C \setminus \{0\} \rightarrow \left(-\pi,\pi\right]$ is
                defined as follows:
    