
Algebra PreAlgebra and Basic Algebra Math Forum 
 LinkBack  Thread Tools  Display Modes 
October 26th, 2013, 10:32 AM  #1 
Newbie Joined: Oct 2013 Posts: 2 Thanks: 0  Complex Numbers question (de Moivres)
Can anyone help me with this problem? In the attached photo, I have highlighted the area I need help with. I don't understand what happens to the ^1/4 , and how it changes the other numbers.  e.g.: why does the 2n(pi) change to pi(n)/2 I have an idea of what happens, but I would like a proper explanation and why it happens so I can know it better. 
October 26th, 2013, 10:58 AM  #2 
Senior Member Joined: Jun 2013 From: London, England Posts: 1,316 Thanks: 116  Re: Complex Numbers question (de Moivres)
DeMoivre's formula says that: This also works for 1/n in the sense that: So, the 1/4 has gone inside the sin and cos. 
October 26th, 2013, 11:55 AM  #3  
Newbie Joined: Oct 2013 Posts: 2 Thanks: 0  Re: Complex Numbers question (de Moivres) Quote:
 

Tags 
complex, moivres, numbers, question 
Search tags for this page 
Click on a term to search for related topics.

Thread Tools  
Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
complex numbers question  Bula  Algebra  1  March 27th, 2013 01:48 PM 
Insane complex numbers question  OriaG  Algebra  16  August 27th, 2012 03:20 PM 
Complex Numbers Question PLEASE HELP  dylan182  Complex Analysis  4  December 16th, 2010 07:05 AM 
Complex numbers question  TsAmE  Complex Analysis  11  November 17th, 2010 05:49 AM 
Insane complex numbers question  OriaG  Calculus  16  December 31st, 1969 04:00 PM 