2a² - 2b² - (a - b)² = 2a² - 2b² - (a² - 2ab + b²) = 2a² - 2b² - a² + 2ab - b² =
= a² + 2ab - 3b²
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2a² - 2b² - (a - b)² = 2a² - 2b² - (a² - 2ab + b²) = 2a² - 2b² - a² + 2ab - b² =
= a² + 2ab - 3b²