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(relatively) Simple math question

I have..

(e^2rt - 1)/ (e^2rt+1)

How does that reduce to...

(e^rt - e^-rt)/(e^rt+e^-rt)

😕

EDIT: DOH JUST FIGURED IT OUT =/

multiple top/bottom by e^-rt.. duhhh
 
I've done this sh!t so many times today trying to prove certain signals are purely real.

/thread
 
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