v 5.4

\begin{aligned} E_{1}^{*} E_{2} + E_{1} E_{2}^{*} & = E_{10} E_{20} [\exp (i (φ_{1} - φ_{2})) + \exp (- i (φ_{1} - φ_{2}))] \\ = 2 E_{10} E_{20} \cos (φ_{1} - φ_{2}) \end{aligned}

${\begin{align*}E_1^* E_2 + E_1 E_2^* &= E_{10}E_ {20} [\exp(i(\varphi_1 - \varphi_2)) + \exp(-i(\varphi_1 - \varphi_2))] \\&= 2E_{10}E_{20}\cos (\varphi_1 - \varphi_2)\end{align*}}$

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