Help With Derivation of Compton Shift

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aliz_khanz
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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.

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From the RHS, you take the square of hf so it becomes h^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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I think this is just a matter of doing the algebra. If this is homework (?) it should be in the homework-section.

Torquil