(a) Let D be an integral domain and c D. Let (x) and (x - c)...

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(a) Let D be an integral domain and c ϵ D. Let ∫(x) imageand ∫(x - c) = imageThen f(x) is irreducible in D[x] if and only ∫(x - c) is irreducible.


(b) For each prime p, the cyclotomic polynomial ∫ = xp-1 + xP-2 + • • • + x + 1 is irreducible in Z[x).

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