Question

If Xn = cos $\frac{ π}{2^n}$ + i sin$\frac{ π}{2^n}$ , then

$\prod_{n=1}^{\infty} x_n =$

• A. 0
• B. 1
• C. -1
• D. i

Answer 1

Answer: (C)

-1

Answer 2

The correct option is: (C) -1