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aª - b² + 2b² - 1
= a¹ - (b¹-2b²+1)
= a¹ - [ ( b² )² - 2 × b² × 1+1²]
= (a² )² - (b² - 1)²
= ( a² + b² - 1) [ a² - ( b² - 1 )]
= ( a² + b² - 1 ) ( a² - b² +1)
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