What is the lowest common multiple of ab(x² + 1) + x(a² + b²) and ab(x² - 1) + x(a² - b²)? - CDS Elementary Mathematics 2014 (II)

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What is the lowest common multiple of ab(x² + 1) + x(a² + b²) and ab(x² – 1) + x(a² – b²)?