I am confused in a thing that is on wikipedia and need to know ur answers on this.This is from the last part of derivation for comton shift.(adsbygoogle = window.adsbygoogle || []).push({});

From the RHS, you take the square of hf so it becomesh^2 f^2 + h^2f ' ^2+2h^2ff 'cos theta

now how can it take the common from the below equation? if it has to take common , it implies that when u r squaring hf , u only square h not f (whereas i think that frequency should also be squarred) am i missing something?

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# Urgent Help Wikipedia Is Confusing On Compton Derivation

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