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Hello, I'm researching about relativity and Doppler effect, most text and book gives the equation for it as

(term with square root is on the numerator, and the term w/o is on the denominator)

while on some text, has the reverse of the fraction part (which is the term with the square root is on the numerator

Are they both equal to each other? I can't seem to express/derive the other one from the other one.

Can you explain what are the difference in both equations.

thanks

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# Homework Help: Doppler effect and Relativity

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