In a triangle ABC, \[{{a}^{3}}\cos (B-C)+{{b}^{3}}\cos (C-A)+{{c}^{3}}\cos (A-B)=\] [Kerala (Engg.) 2002]

In a triangle ABC, \[{{a}^{3}}\cos (B-C)+{{b}^{3}}\cos (C-A)+{{c}^{3}}

1.	In a triangle ABC, \[{{a}^{3}}\cos (B-C)+{{b}^{3}}\cos (C-A)+{{c}^{3}}\cos (A-B)=\] [Kerala (Engg.) 2002]
A.	\[abc\]
B.	\[3abc\]
C.	\[a+b+c\]
D.	None of these
Answer» C. \[a+b+c\]

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In a triangle ABC, \[{{a}^{3}}\cos (B-C)+{{b}^{3}}\cos (C-A)+{{c}^{3}}\cos (A-B)=\] [Kerala (Engg.) 2002]

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