If \( \sqrt{4+\sqrt{8-\sqrt{32+\sqrt{768}}}}=a \sqrt{2} \cos \left(\frac{11 \pi}{b}\right) \), w.... VIDEO
If \( \sqrt{4+\sqrt{8-\sqrt{32+\sqrt{768}}}}=a \sqrt{2} \cos \left(\frac{11 \pi}{b}\right) \), where \( a \)
\( \mathrm{P} \)
and \( b \) are natural numbers, then \( \frac{b}{a} \) is divisible by
(1) 2
(2) 4
(3) 3
(4) 6
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