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hello ,need help pls , tysm  !!

 Jun 9, 2021
 #1
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I don't know what this "cis" function is. 

So I would love if someone could please explain to be. 

On Youtube, there is a video by Harold Walden proving that cis(a)*cis(b) = cis(a+b). 

(sqrt(2)/6 * sqrt(6)/4) * (cis(3pi/5) * cis(2pi/3))

sqrt(12)/24 * cis(3pi/5 + 2pi/3)

sqrt(3)/12 * cis(19pi/15)

 

=^._.^=

 Jun 9, 2021

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