1) (x + 2y)² - (x - y)(y + x) = x² + 4xy + 4y² - (x² - y²) = x² + 4xy + 4y² - x² + y² = 5y² + 4xy
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1) (x + 2y)² - (x - y)(y + x) = x² + 4xy + 4y² - (x² - y²) = x² + 4xy + 4y² - x² + y² = 5y² + 4xy