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Jun 17, 2020 at 11:46 comment added Sameer Baheti Then, $\cosh({\rm arctanh}~v)=\gamma$ becomes the last step. I' ll try to find out why! Thank you $3000$!
Jun 17, 2020 at 11:46 vote accept Sameer Baheti
Jun 17, 2020 at 11:23 history answered robphy CC BY-SA 4.0