A \( 2 \cos{\left ( \frac{\theta}{2^{n - 1}} \right )} \)
B \( 2 \cos{\left ( \frac{\theta}{2^{n}} \right )} \)
C \( 2 \cos{\left ( \frac{\theta}{2^{n + 1}} \right )} \)
D \( \left ( 2 \cos{} \right ) \frac{n \theta}{2} \)
Correct Answer: Option B
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