(3 - b²)² - 1 = (3 - b²)² - 1² = (3 - b² - 1)(3 - b² + 1) = (2 - b²)(4 - b²) =
= (2 - b²)(2 - b )(2 + b)
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(3 - b²)² - 1 = (3 - b²)² - 1² = (3 - b² - 1)(3 - b² + 1) = (2 - b²)(4 - b²) =
= (2 - b²)(2 - b )(2 + b)