Question

Find the angle x when 0 <= x <= 2 * pi when
cos 2x + 2 cos^2 (x/2) = 1

Answer 1

Step-by-step explanation:

1. $cos(2x) + 1 + cos(x) = 1 \\ cos(2x) = \cos(\pi - x) \\ x = \pi \div 3$