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

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

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