1. Aug 25, 2012 #1

   swampwiz

   

   It seems that this term comes up in solving the cubic equation. While there is the identity for the half-angle, there doesn't seem to be one for third-angle.

    

   swampwiz, Aug 25, 2012
2. 
   Phys.org - latest science and technology news stories on Phys.org

   • • Mathematicians solve age-old spaghetti mystery
   • • Mathematician discusses solving a seemingly unsolvable equation
   • • Kurdish refugee wins 'Nobel of mathematics' Fields medal (Update)
3. Aug 25, 2012 #2

   coolul007

   

   Gold Member

   http://en.wikipedia.org/wiki/Trig_Identity

    

   coolul007, Aug 25, 2012
4. Aug 26, 2012 #3

   JJacquelin

   

   Hi !
   
   The identity involves complex terms :

    

   Attached Files:

   • 

     Angle trisection.JPG

     File size:

     8.8 KB

     Views:

     132

   Last edited: Aug 26, 2012

   JJacquelin, Aug 26, 2012
5. Aug 28, 2012 #4

   swampwiz

   

   OK, I understand the general form. I didn't think to use an integer fraction in lieu of an integer. (Actually, it appears that *any* number could be used there.)

    

   swampwiz, Aug 28, 2012

• Log in with Facebook
• Log in with Twitter

Your name or email address:

Do you already have an account?

• No, create an account now.
• Yes, my password is:
• Forgot your password?

Stay logged in