is equal to [RPET 2000]

1.	is equal to [RPET 2000]
A.	\[-{{e}^{x}}\tan \,\left( x/2 \right)\]
B.	\[-{{e}^{x}}\cot \,\left( x/2 \right)\]
C.	\[-\frac{1}{2}{{e}^{x}}\tan \,\left( \frac{x}{2} \right)\]
D.	\[\frac{1}{2}{{e}^{x}}\cot \,\left( \frac{x}{2} \right)\]
Answer» C. \[-\frac{1}{2}{{e}^{x}}\tan \,\left( \frac{x}{2} \right)\]

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is equal to [RPET 2000]

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