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যদি

0 ° < θ < 180 °

\sqrt{2 + \sqrt{2 + \sqrt{. . . . . + 2 (1 +} \cos θ}} = ?

2 \cos \frac{θ}{2^{n - 1}}

2 \cos \frac{θ}{2^{n}}

2 \cos \frac{θ}{2^{n + 1}}

2 \cos \frac{n θ}{2}

2 \cos \frac{θ}{2 n}

ANS : 2

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