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**doppler formula help please!:)**

Hello, i see the doppler formula in 2 different forms one being f1=f2 (Vw/Vw-Vs) and the other f1=f2/(1+Vs/Vw)

f1= Doppler frequency

f2= Source frequency

Vw= Speed of sound

Vs= Speed of source

the problem i am having is understanding how these are equivalent? how fit they get from one to the other? And how would you solve for Vs in the first doppler equation stated? any help would be greatly appreciated :)