Question

8. Two forces of magnitudes k cos A and k cos B act along
CA, CB of a AABC. Prove that their resultant is k sin C.
(B.Sc.86 Calicut; B.Sc. 79, 83 M.KU.)
[Hint:- Use the result that in a triangle
cos2 A+ cos2 B + cos2 C=1- 2 cos A cos B cos C)​

Answer 1

Answer:

Two forces of magnitudes k cos A and k cos B act along CA,CB of a triangle ABC. Prove that their resultant is k sin C.[Hint:-Use the result that in a triangle cos*cos A+cos*cos B+ cos*cos C=1-2 cos A cos B cos C]