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2 \sin \frac{π}{16} = ?

\sqrt{2 - \sqrt{2 - \sqrt{2}}}

\sqrt{2 - \sqrt{2 + \sqrt{2}}}

\sqrt{2 + \sqrt{2 - \sqrt{2}}}

\sqrt{2 + \sqrt{2 + \sqrt{2}}}

ANS : 2

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