factorize 4x^(2)-9y^(2)+12y-4
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4x² - 9y² + 12y - 4
= 4x² - (9y² - 12y + 4)
= (2x)² - [(3y)² - 2(3y)(2) + (2)²]
= (2x)² - (3y - 2)²
= [2x - (3y - 2)][2x + (3y - 2)]
= (2x - 3y + 2)(2x + 3y - 2).
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