A) \[\frac{a-1}{2a}\]
B) \[\frac{1-{{a}^{2}}}{2a}\]
C) \[{{a}^{2}}-1\]
D) \[\frac{{{a}^{2}}-1}{{{a}^{2}}+1}\]
E) None of these
Correct Answer: B
Solution :
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