Отметьте верные формулы среди предложенных

x² - y² = (x - y)(x - y)

(x - y)² = x² - 2xy - y²

(x - y)² = x² - 2xy + y²

x² + 4xy + y² = (x + y)²

(x + y)² = x² + y²

(x - y)² = x² - y²

(x + y)² = x² + 2xy + y²

(x - y)(x + y) = x² - y²
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