
Algebra PreAlgebra and Basic Algebra Math Forum 
 LinkBack  Thread Tools  Display Modes 
December 29th, 2013, 03:39 AM  #1 
Math Team Joined: Jul 2011 From: North America, 42nd parallel Posts: 3,372 Thanks: 234  Cube roots of 1
Find all 3 roots of In terms of only. Show all work. 
December 29th, 2013, 03:49 AM  #2 
Senior Member Joined: Jul 2013 From: Croatia Posts: 180 Thanks: 11  Re: Cube roots of 1
Do you mean it like this? Or do want to also to be in terms of i? 
December 29th, 2013, 04:01 AM  #3  
Math Team Joined: Jul 2011 From: North America, 42nd parallel Posts: 3,372 Thanks: 234  Re: Cube roots of 1 Quote:
I like what you did with that is one solution in terms of Can you transform the other 2 solutions so that they are both a SINGLE term of ? Hint : You can go the long way or try to rethink the problem using rotations.  
December 29th, 2013, 05:39 AM  #4 
Math Team Joined: Mar 2012 From: India, West Bengal Posts: 3,871 Thanks: 86 Math Focus: Number Theory  Re: Cube roots of 1
Dual to crom: (Edited) Off the chain: (Edited) Furthermore: 
December 29th, 2013, 07:22 AM  #5  
Math Team Joined: Jul 2011 From: North America, 42nd parallel Posts: 3,372 Thanks: 234  Re: Cube roots of 1 Quote:
Ha  Ha , admittedly , I was looking for which is equivalent to your 'off the chain' version but it's nice to see you both working the cheat kobayashi maru style , especially [color=#00FF00]mathbalarka [/color] who really went to town on it!! BTW , since [color=#0000FF]Crom [/color] offered ... give me in terms of a single term of  
December 29th, 2013, 11:28 AM  #6 
Senior Member Joined: Jul 2013 From: Croatia Posts: 180 Thanks: 11  Re: Cube roots of 1
Let's take then ( we also have as you said, but I will use this one ) then Is this how you meant or? 
December 29th, 2013, 08:05 PM  #7  
Math Team Joined: Jul 2011 From: North America, 42nd parallel Posts: 3,372 Thanks: 234  Re: Cube roots of 1 Quote:
Let me give the final result and ask you (or anyone else interested) to provide the calculations, if you don't mind. Highlight below. *^*[color=#FFFFFF]you can hide the answer by choosing the appropriate font color [/color][/color] I have 'hidden' a word sentence and the latex fraction 1/3. To see it , quote my post , delete all the color tags only, then click Preview. If this is too much work then post it unhidden , I don't mind. The result I'm looking for is Can you show the steps needed to get there? Note it is only one term using and two constants. Sorry about the tiny exponent, I don't know how to enlarge the font inside latex. In words, eye to the power of [(minus eye times the natural logarithm of three) divided by pi] If anyone knows how to enlarge the font inside latex, please advise.  
December 30th, 2013, 02:57 AM  #8 
Math Team Joined: Apr 2010 Posts: 2,780 Thanks: 361  Re: Cube roots of 1
You could use \large, \Large, \huge or \Huge to enlarge LaTeX. Likewise \small or \tiny to make it smaller. 
December 30th, 2013, 04:06 AM  #9  
Math Team Joined: Mar 2012 From: India, West Bengal Posts: 3,871 Thanks: 86 Math Focus: Number Theory  Re: Cube roots of 1 Quote:
And transform everything to by the simple yet interesting identity We can generalize this to any elementary number (i.e., an algebraic number with minimal polynomial having solvable Galois group), see Gauss sums and KroneckerWeber theorem and the later for anybody who wants to dig deep in these things.  
December 30th, 2013, 04:09 AM  #10  
Math Team Joined: Jul 2011 From: North America, 42nd parallel Posts: 3,372 Thanks: 234  Re: Cube roots of 1 Quote:
Quote:
I actually did it a little differently, Now, on RHS we want to change e to 3, get rid of , get rid of the negative and keep the 2 in the denominator for use as square root And the result follows on the LHS.  

Tags 
cube, roots 
Thread Tools  
Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Cube roots of unity question 2  Dean1884  Algebra  4  August 16th, 2013 08:03 PM 
Cube roots of unity question 1..  Dean1884  Algebra  3  August 16th, 2013 12:37 AM 
Finding Cube Roots using Geometry  long_quach  Geometry  10  February 19th, 2013 12:11 AM 
Derivative of cube roots and trig  imcutenfresa  Calculus  1  September 20th, 2009 04:34 AM 
Three cube roots of 1  dequinox  Complex Analysis  1  June 9th, 2009 02:00 PM 