I've been obsessed with the derivation in the attachment for hours now, all rights & credits to the one who came up with it, but I completely can't follow it. How does one get rid of the e's and epsilons?! How to combine the momentum and energy equations? Squaring gives for me just onworkable equations, but somehow it has to make sense, but I cant see it, both steps.(adsbygoogle = window.adsbygoogle || []).push({});

Anyone who could help me out?

P.S.

omega=frequency

vector k = momentum

k = wavenumber

angle theta = the emission angle (<pi/2)

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# Derivation photon emission angle/frequency

Can you offer guidance or do you also need help?

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