(a - b - c) ² = [(a - b) - c]² = (a - b)² - 2 * (a - b) * c + c² =
= a² - 2ab + b² - 2ac + 2bc + c ² = a² + b² + c² + 2bc - 2ab - 2ac
a² + b² + c² + 2bc - 2ab - 2ac = a² + b² + c ² + 2bc - 2ab - 2ac
Тождество доказано
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(a - b - c) ² = [(a - b) - c]² = (a - b)² - 2 * (a - b) * c + c² =
= a² - 2ab + b² - 2ac + 2bc + c ² = a² + b² + c² + 2bc - 2ab - 2ac
a² + b² + c² + 2bc - 2ab - 2ac = a² + b² + c ² + 2bc - 2ab - 2ac
Тождество доказано