\[\frac{d}{dx}\log \tan \left( \frac{\pi }{4}+\frac{x}{2} \right)=\]

1.	\[\frac{d}{dx}\log \tan \left( \frac{\pi }{4}+\frac{x}{2} \right)=\]
A.	\[\cos \text{ec}\,x\]
B.	\[-\cos \text{ec}\,x\]
C.	\[\sec x\]
D.	\[-\sec x\]
Answer» D. \[-\sec x\]

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\[\frac{d}{dx}\log \tan \left( \frac{\pi }{4}+\frac{x}{2} \right)=\]

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