Equating argument of 2 complex equal complex numbers (1 Viewer)

[mabc1]

Hi guys quick question if I have cis x = cis y , can I say x = y + 2kpi (k is integer)

 

[sida1049]

Yup. And you generally should.

 

[mabc1]

Ok thanks I’ve been getting mixed answers ( school marked it incorrect XC )

 

[sida1049]

Ok thanks I’ve been getting mixed answers ( school marked it incorrect XC )

The only issue is if they have explicitly stated somewhere that the argument is limited to [0,2pi] ("principal" argument) or whatever. But if they haven't specified this, then you are definitely correct.