The smallest positive integral value of ...

The smallest positive integral value of n such that `[(1+"sin"pi/8+i"cos"(pi)/8)/(1+"sin"(pi)/8-i"cos"(pi)/8)]^(n)` is purely imaginary is n=

A

8

B

4

C

3

D

2

Verified by Experts

The correct Answer is:

B

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