(a - b - c)² = ((a-b) - c)² = (a - b)² - 2c(a - b) + c² =
= a² - 2ab + b² - 2ac + 2bc + c² = a² + b² + c² + 2bc - 2ab - 2ac
(a - b - c)² = a² + b² + c² + 2bc - 2ab - 2ac
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(a - b - c)² = ((a-b) - c)² = (a - b)² - 2c(a - b) + c² =
= a² - 2ab + b² - 2ac + 2bc + c² = a² + b² + c² + 2bc - 2ab - 2ac
(a - b - c)² = a² + b² + c² + 2bc - 2ab - 2ac