A) \[{{p}^{2}}+2pq+{{q}^{2}}=1\]
B) \[{{p}^{2}}+pq+{{q}^{2}}=1\]
C) \[{{p}^{2}}+2pq+{{q}^{2}}=0\]
D) \[{{p}^{2}}+pq+{{q}^{2}}=0\]
Correct Answer: A
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