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
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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 :

    

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   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

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