A) \[{{a}^{2}}+{{b}^{2}}+{{c}^{2}}-2ca\]
B) \[2{{a}^{2}}+{{b}^{2}}+{{c}^{2}}-2ca\]
C) \[2\,\,({{a}^{2}}+{{b}^{2}}+{{c}^{2}}-2ca)\]
D) \[2\,\,({{a}^{2}}-{{b}^{2}}+{{c}^{2}}-2ca)\]
E) None of these
Correct Answer: C
Solution :
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