Factor the sum or difference of two cubes completely.z9 + 1
A. (z + 1)(z2 - z + 1)(z6 - z3 + 1)
B. (z - 1)(z + 1)(z6 - z3 + 1)
C. (z3 + 1)(z6 - z3 + 1)
D. (z - 1)(z2 + z + 1)(z6 + z3 + 1)
Answer: A
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