Question

The real value of ‘α’ for which $\frac{1 -isinα}{1+ 2isinα}$ is purely real is

• A. $(n+1) \frac{\pi}{2}, n ∈ N$
• B. $(2n+1) \frac{\pi}{2}, n ∈ N$
• C. $n{\pi}, n ∈ N$
• D. $(2n-1) \frac{\pi}{2}, n ∈ N$

Answer 1

Answer: (C)

$n{\pi}, n ∈ N$

Answer 2

The correct answer is Option (C) : $n{\pi}, n ∈ N$