Question

If $n\in N-\{1\}$., then the value of $(1+\cos \frac{\pi }{n}+i\sin \frac{\pi }{n}{)}^n$
$(1+\cos \frac{\pi }{n}-i\sin \frac{\pi }{n}{)}^n$ is :

• A. -2
• B. -1
• C. 2
• D. 1

Answer 1

Answer: (B)

Correct answer is (b) -1