4a²b² - a² + 2ab - b²
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ans =4a2 b2 -a2 +2ab-b2
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4a²b²-a²+2ab -b²
(2ab)² - (a² +2ab + b²)
2ab² -(a-b)²
(2ab+a-b) (2ab -a+b)
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