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p2 + 2pq + q2 = 1

q2 + 2pq + (p2 - 1) = 0

q = 1/2 [ -2p plus or minus sqrt( 4p2 - 4p2 + 4 ) ]

q = -1 - p

q = 1 - p

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Q: What is q in this equation p2 plus 2pq plus q2 equals 1?
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