Question

7. (a) cos A sin (B-C) + cos B sin (C-A) + cos C sin (A - B)=0.
(b) sin A sin (B-C) + sin B sin (C- A) + sin C sin (A - B)=0.


Plzz prove it.

Unnecessary answers will be reported.​

Answer 1

Step-by-step explanation:

this is the 7(a)&(b)....hope u will like it