\[\int_{{}}^{{}}{{{\tan }^{-1}}\sqrt{\frac{1-\cos 2x}{1+\cos 2x}}}\ dx

1.	\[\int_{{}}^{{}}{{{\tan }^{-1}}\sqrt{\frac{1-\cos 2x}{1+\cos 2x}}}\ dx=\]
A.	\[2{{x}^{2}}+c\]
B.	\[{{x}^{2}}+c\]
C.	\[\frac{{{x}^{2}}}{2}+c\]
D.	\[2x+c\]
Answer» D. \[2x+c\]

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\[\int_{{}}^{{}}{{{\tan }^{-1}}\sqrt{\frac{1-\cos 2x}{1+\cos 2x}}}\ dx=\]

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