Find all solutions to 2 cos ( θ ) = 1 on the interval 0 ≤ θ < 2 π

Answer 1

So: Cos θ= 1/2 = cos π/3. Using the unit circle we get:

θ = π/3 , 5π/3. Since Θ is between 0 and 2π.( the answers are π/3 and 2π - π/3).

Answer 2

2cosθ=1, so cosθ=1/2

That should look familiar. Use your unit circle.