A) 0
B) \[a+b+c\]
C) \[{{a}^{2}}+{{b}^{2}}+{{c}^{2}}\]
D) None of these
Correct Answer: C
Solution :
On putting the values of \[\cos A,\cos B\]and\[\cos C\], we get the required result i.e., \[{{a}^{2}}+{{b}^{2}}+{{c}^{2}}\].
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