A) \[\frac{1}{2}\,\,({{e}^{\pi /2}}-1)\]
B) \[\frac{1}{2}\,\,({{e}^{\pi /2}}+1)\]
C) \[\frac{1}{2}\,\,(1-{{e}^{\pi /2}})\]
D) \[2\,\,({{e}^{\pi /2}}+1)\]
E) None of these
Correct Answer: B
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