Add:- a2+b²+c²-3abc and a²-b²+c²+abc.please step by step explanation
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Step-by-step explanation: a² + b² + c² = 2 (a - b - c ) - 3. => a² + b² + c² = 2a - 2b - 2c -3. => a² + b² + c² - 2a + 2b + 2c + ...
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