No idea for starting the following question..
 

Asked by nitishkrnehu09 | 23rd Nov, 2017, 09:43: AM

Expert Answer:

https://www.topperlearning.com/forums/home-work-help-19/prove-that-tan9-tan27-tan63-tan81-4-mathematics-trigonometric-functions-55998/reply
 
A similar question is already been answered, please refer the above link.

Answered by Sneha shidid | 29th Nov, 2017, 11:09: AM