Question

$\sqrt{2 + \sqrt{2 + \sqrt{2 + 2\cos(8\theta)}}}$=

• A. $\sin 2\theta$
• B. $2\sin \theta$
• C. $2\cos \theta$
• D. $2 \cos \frac{\theta}{2}$

Answer 1

Answer: (C)

$2\cos \theta$

Answer 2

The correct answer is (C) : 2 cos θ.