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a8 - b8 = ((a4)2 - (b4)2) [the difference of two squares]

= (a4 + b4)(a4 - b4)

= (a4 + b4)(a2 + b2)(a2 - b2)

= (a4 + b4)(a2 + b2)(a + b)(a -b)

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13y ago

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