plzzz ans......factorise.....Thnk u
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(a² - 1)(b² - 1) + 4ab
= a²(b² - 1) -1.(b² - 1) + 4ab
= a²b² - a² - b² + 1 + 4ab
= a²b² + 1² + 2(ab).1 -{a² + b² - 2ab}
= (ab + 1)² - (a - b)²
= (ab + 1 - a + b)(ab + 1 + a - b)
= a²(b² - 1) -1.(b² - 1) + 4ab
= a²b² - a² - b² + 1 + 4ab
= a²b² + 1² + 2(ab).1 -{a² + b² - 2ab}
= (ab + 1)² - (a - b)²
= (ab + 1 - a + b)(ab + 1 + a - b)
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