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sina+sinb+sinc=0 and cosa+csb+cosc=0 then cos(a+b)+cos(b+c)+cos(a+c)=

sina+sinb+sinc=0 and cosa+csb+cosc=0 then cos(a+b)+cos(b+c)+cos(a+c)=

Grade:12

1 Answers

Arun
25763 Points
3 years ago
Dear student
I think that you have done a mistake in writing. please check that
it should be 
cos (A – B) + cos(B – C) + cos (C – A)

Regards
Arun

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