a^5 - 1 = (a-1)(a^4 + a^3 + a^2 + a + 1)
a^5 - b^5 = (a-b)(a^4 + a^3*b + a^2*b^2 + a*b^3 + b^4)
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a^5 - 1 = (a-1)(a^4 + a^3 + a^2 + a + 1)
a^5 - b^5 = (a-b)(a^4 + a^3*b + a^2*b^2 + a*b^3 + b^4)