In\[\Delta ABC,\] if \[2(bc\cos A+ca\cos B+ab\cos C)=\]

1.	In\[\Delta ABC,\] if \[2(bc\cos A+ca\cos B+ab\cos C)=\]
A.	0
B.	\[a+b+c\]
C.	\[{{a}^{2}}+{{b}^{2}}+{{c}^{2}}\]
D.	None of these
Answer» D. None of these

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In\[\Delta ABC,\] if \[2(bc\cos A+ca\cos B+ab\cos C)=\]

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