evaluate : (2a +3b + 4c)^2 + (2a- 3b + 4c)^2 + (2a+ 3b – 4c)^2​

evaluate : (2a +3b + 4c)^2 + (2a- 3b + 4c)^2 + (2a+ 3b – 4c)^2​

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