यदि $x_n = \cos \frac{\pi}{2^n} + i \sin \frac{\pi}{2^n}$ है,तो $\prod_{n=1}^{\infty} x_n$ का मान ज्ञात कीजिए।

  • A
    $-1$
  • B
    $1$
  • C
    $\frac{1}{\sqrt{2}}$
  • D
    $\frac{i}{\sqrt{2}}$

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$\left[\frac{1+\cos \left(\frac{\pi}{12}\right)+i \sin \left(\frac{\pi}{12}\right)}{1+\cos \left(\frac{\pi}{12}\right)-i \sin \left(\frac{\pi}{12}\right)}\right]^{72}=$

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