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8 a^{3} - 1

(2 a - 1) (2 a - 1) (2 a - 1)

(2 a - 1) (4 a^{2} - 1 + 1)

(2 a - 1) (4 a^{2} + 2 a + 1)

(2 a + 1) (4 a^{2} - 2 a + 1)

ANS : 3

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