factorise
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This sum can be solved by the identity (a - b)²
then the ans is a² - 2ab - b²
thus (4x - 2y)² = 16x² - 16xy + 4y²
then the ans is a² - 2ab - b²
thus (4x - 2y)² = 16x² - 16xy + 4y²
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