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