\[\int_{{}}^{{}}{\frac{1}{\sqrt{1+\cos x}}\ dx=}\]

1.	\[\int_{{}}^{{}}{\frac{1}{\sqrt{1+\cos x}}\ dx=}\]
A.	\[\sqrt{2}\log \left( \sec \frac{x}{2}+\tan \frac{x}{2} \right)+K\]
B.	\[\frac{1}{\sqrt{2}}\log \left( \sec \frac{x}{2}+\tan \frac{x}{2} \right)+K\]
C.	\[\log \left( \sec \frac{x}{2}+\tan \frac{x}{2} \right)+K\]
D.	None of these
Answer» B. \[\frac{1}{\sqrt{2}}\log \left( \sec \frac{x}{2}+\tan \frac{x}{2} \right)+K\]

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\[\int_{{}}^{{}}{\frac{1}{\sqrt{1+\cos x}}\ dx=}\]

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