A) \[\frac{p+q}{2pq}\]
B) \[\frac{p-q}{2pq}\]
C) \[\frac{{{p}^{2}}-{{q}^{2}}}{2pq}\]
D) \[\frac{{{p}^{2}}+{{q}^{2}}}{2pq}\]
E) None of these
Correct Answer: C
Solution :
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