How can I show that(adsbygoogle = window.adsbygoogle || []).push({});

[tex]Aexpi(\omega t - kx + \phi_{1}) + Aexpi(\omega t + kx + \phi_{2}) = 2Aexpi(\omega t + \frac{\phi_{1} + \phi_{2}}{2})cos(kx - \frac{\phi_{1} - \phi_{2}}{2})[/tex]? My book states this without proof, as if it was obvious.

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# Homework Help: Adding two complex functions?

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