• In any triangle ABC, show that: (i) a³cos(B-C) + b³cos(C-A) + c³cos(A-B) = 3abc

Search in google:   a^3cos(b-c)  3abc . I've already answered the same question here in http://www.askiitians.com

Dear Lab Bhattacharjee,

 

We would like to thank you for sharing your knowledge with students worldwide. It will be great if you can provide question link here to student if you have answered this type of question earlier. This will help the student in much easier way. However, this time we are providing the question link here in which you have already answered this question.

 

 

Hope that this will help Andrew

 

Thanks

Forum Team