$\int {{{dx} \over {\cos x + \sqrt 3 \sin x}}} $ equals

Question

$\log \,\tan \,\left( {{x \over 2} + {\pi \over {12}}} \right) + C$

$\log \,\tan \,\left( {{x \over 2} - {\pi \over {12}}} \right) + C$

$\,{1 \over 2}\,\log \,\tan \,\left( {{x \over 2} + {\pi \over {12}}} \right) + C$

$\,{1 \over 2}\,\log \,\tan \,\left( {{x \over 2} - {\pi \over {12}}} \right) + C$

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