\( \sqrt{2+\sqrt{2+2 \cos 4 \theta}}=\quad[ \) where \( \theta \in(...
\( \sqrt{2+\sqrt{2+2 \cos 4 \theta}}=\quad[ \) where \( \theta \in(0, \pi / 4)] \)
P
(1) \( \cos \theta \)
(2) \( \sin \theta \)
W)
(3) \( 2 \cos \theta \)
(4) \( 2 \sin \theta \)
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