\[\sqrt{2+\sqrt{2+2\cos 4\theta }}=\]

1.	\[\sqrt{2+\sqrt{2+2\cos 4\theta }}=\]
A.	\[\cos \theta \]
B.	\[\sin \theta \]
C.	\[2\cos \theta \]
D.	\[2\sin \theta \]
Answer» D. \[2\sin \theta \]

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\[\sqrt{2+\sqrt{2+2\cos 4\theta }}=\]

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