(a square +b square -ab)
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▪︎( a² + b² - ab )
= (a+b)² - 2ab - ab ;as a²+b² = (a+b)² - 2ab
{♡. = (a+b)² - 3ab }
OR after further solution;
♡. = a² + b² + 2ab - 3ab
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