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(1+z+z^2)^2 and (p^2-pq+q^2)^2
I partially understand the second line which would be 1+z^2+z^4+2z+2z^2+2z^3 but I don't understand where the 2 comes from in the second half of that line.
p.s.(^2 means squared or cubed etc.)
Please help me out A.S.A.P.! I have a quiz on this tomorrow! Thank-you, A.R.