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Answer:
HCF = 1
Explanation:
By factorising the terms, we get:
x² - 1 = (x + 1)(x - 1)
x³ + 1 = (x + 1)(x² - x + 1)
x³ - 1 = (x - 1)(x² + x + 1)
The common factor in the three terms is 1