A) \[2{{a}^{2}}+{{b}^{2}}+{{c}^{2}}-2ab-2bc-2ca\]
B) \[4{{a}^{2}}+{{b}^{2}}+{{c}^{2}}-4ab+4bc+4ca\]
C) \[4{{a}^{2}}-{{b}^{2}}+{{c}^{2}}-4ab-4bc-4ca\]
D) \[4{{a}^{2}}+{{b}^{2}}+{{c}^{2}}+4ab-2bc-4ac\]
Correct Answer: D
Solution :
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