A) \[18\,{{p}^{2}}{{q}^{2}}-3\,pq+1\]
B) \[19\,{{p}^{2}}{{q}^{2}}-pq+1\]
C) \[20\,{{p}^{2}}{{q}^{2}}-5\,pq+1\]
D) \[18\,{{p}^{2}}{{q}^{2}}-4\,pq+1\]
E) None of these
Correct Answer: B
Solution :
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