the question and solution are attached but i cant understand, can somebody please guide

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- April 22nd 2013, 03:50 AMmathfag188complex numbers problem
the question and solution are attached but i cant understand, can somebody please guide

- April 22nd 2013, 04:22 AMchiroRe: complex numbers problem
Hey mathfag188.

Are you aware of De-Moivre's theorem and how to use that to solve roots for z^n = 1? - April 22nd 2013, 04:35 AMProve ItRe: complex numbers problem

- April 22nd 2013, 05:48 AMmathfag188Re: complex numbers problem
I dont understand what yuo did in 8th step, how you expanded it?

other thing, did you read the solution i posted? there its done in almost 5 steps :P

actually what i wanted to ask and i was stuck on this step

how does the following happen?

in solution it says "cis" where i have put cos, as i was thinking it was a typo in solution but if there is something as cis do let me know(Worried)

- April 22nd 2013, 06:07 AMProve ItRe: complex numbers problem
Surely you know how to expand two binomials...

You're welcome btw >< - April 22nd 2013, 06:26 AMmathfag188Re: complex numbers problem
but my problem isnt solved yet