factorize a^2 +b^2-ab
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a² + b² - ab
[ a² + b² = ( a + b )² - 2ab ]
= ( a + b )² - 2ab - ab
= ( a + b )² - 3ab
[ a² + b² = ( a + b )² - 2ab ]
= ( a + b )² - 2ab - ab
= ( a + b )² - 3ab
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