A) 0
B) 1
C) \[{{a}^{2}}+{{b}^{2}}+{{c}^{2}}\]
D) \[2({{a}^{2}}+{{b}^{2}}+{{c}^{2}})\]
Correct Answer: A
Solution :
\[\Sigma {{a}^{2}}({{\cos }^{2}}B-{{\cos }^{2}}C)=\Sigma {{a}^{2}}({{\sin }^{2}}C-{{\sin }^{2}}B)\] \[={{k}^{2}}\Sigma {{a}^{2}}({{c}^{2}}-{{b}^{2}})=0\].You need to login to perform this action.
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